diff --git a/benchmark/monetdb/usability.md b/benchmark/monetdb/usability.md
new file mode 100644
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+++ b/benchmark/monetdb/usability.md
@@ -0,0 +1,1165 @@
+Go to https://www.monetdb.org/
+
+The graphical design of the website is a bit old-fashioned but I do not afraid.
+
+Dowload now.
+Latest binary releases.
+Ubuntu & Debian.
+
+https://www.monetdb.org/downloads/deb/
+
+Go to the server where you want to install MonetDB.
+```
+$ sudo mcedit /etc/apt/sources.list.d/monetdb.list
+```
+Write:
+```
+deb https://dev.monetdb.org/downloads/deb/ bionic monetdb
+```
+
+```
+$ wget --output-document=- https://www.monetdb.org/downloads/MonetDB-GPG-KEY | sudo apt-key add -
+
+$ sudo apt update
+$ sudo apt install monetdb5-sql monetdb-client
+
+$ sudo systemctl enable monetdbd
+$ sudo systemctl start monetdbd
+$ sudo usermod -a -G monetdb $USER
+```
+
+Logout and login back to your server.
+
+Tutorial:
+https://www.monetdb.org/Documentation/UserGuide/Tutorial
+
+Creating the database:
+
+```
+$ sudo mkdir /opt/monetdb
+$ sudo chmod 777 /opt/monetdb
+$ monetdbd create /opt/monetdb
+
+$ monetdbd start /opt/monetdb
+cannot remove socket files
+```
+
+Don't know what it's doing but I hope it's Ok to ignore.
+
+```
+$ monetdb create test
+created database in maintenance mode: test
+
+$ monetdb release test
+taken database out of maintenance mode: test
+```
+
+Run client:
+```
+$ mclient -u monetdb -d test
+```
+
+Type password: monetdb
+
+```
+$ mclient -u monetdb -d test
+password:
+Welcome to mclient, the MonetDB/SQL interactive terminal (Jun2020-SP1)
+Database: MonetDB v11.37.11 (Jun2020-SP1), 'mapi:monetdb://mtlog-perftest03j:50000/test'
+FOLLOW US on https://twitter.com/MonetDB or https://github.com/MonetDB/MonetDB
+Type \q to quit, \? for a list of available commands
+auto commit mode: on
+sql>SELECT 1
+more>;
++------+
+| %2   |
++======+
+|    1 |
++------+
+1 tuple
+```
+
+Yes, it works.
+The only downside is the lack of whitespace after `sql>`.
+
+Upload the dataset.
+
+```
+CREATE TABLE hits
+(
+    "WatchID" BIGINT,
+    "JavaEnable" TINYINT,
+    "Title" TEXT,
+    "GoodEvent" SMALLINT,
+    "EventTime" TIMESTAMP,
+    "EventDate" Date,
+    "CounterID" INTEGER,
+    "ClientIP" INTEGER,
+    "RegionID" INTEGER,
+    "UserID" BIGINT,
+    "CounterClass" TINYINT,
+    "OS" TINYINT,
+    "UserAgent" TINYINT,
+    "URL" TEXT,
+    "Referer" TEXT,
+    "Refresh" TINYINT,
+    "RefererCategoryID" SMALLINT,
+    "RefererRegionID" INTEGER,
+    "URLCategoryID" SMALLINT,
+    "URLRegionID" INTEGER,
+    "ResolutionWidth" SMALLINT,
+    "ResolutionHeight" SMALLINT,
+    "ResolutionDepth" TINYINT,
+    "FlashMajor" TINYINT,
+    "FlashMinor" TINYINT,
+    "FlashMinor2" TEXT,
+    "NetMajor" TINYINT,
+    "NetMinor" TINYINT,
+    "UserAgentMajor" SMALLINT,
+    "UserAgentMinor" TEXT(16),
+    "CookieEnable" TINYINT,
+    "JavascriptEnable" TINYINT,
+    "IsMobile" TINYINT,
+    "MobilePhone" TINYINT,
+    "MobilePhoneModel" TEXT,
+    "Params" TEXT,
+    "IPNetworkID" INTEGER,
+    "TraficSourceID" TINYINT,
+    "SearchEngineID" SMALLINT,
+    "SearchPhrase" TEXT,
+    "AdvEngineID" TINYINT,
+    "IsArtifical" TINYINT,
+    "WindowClientWidth" SMALLINT,
+    "WindowClientHeight" SMALLINT,
+    "ClientTimeZone" SMALLINT,
+    "ClientEventTime" TIMESTAMP,
+    "SilverlightVersion1" TINYINT,
+    "SilverlightVersion2" TINYINT,
+    "SilverlightVersion3" INTEGER,
+    "SilverlightVersion4" SMALLINT,
+    "PageCharset" TEXT,
+    "CodeVersion" INTEGER,
+    "IsLink" TINYINT,
+    "IsDownload" TINYINT,
+    "IsNotBounce" TINYINT,
+    "FUniqID" BIGINT,
+    "OriginalURL" TEXT,
+    "HID" INTEGER,
+    "IsOldCounter" TINYINT,
+    "IsEvent" TINYINT,
+    "IsParameter" TINYINT,
+    "DontCountHits" TINYINT,
+    "WithHash" TINYINT,
+    "HitColor" TEXT(8),
+    "LocalEventTime" TIMESTAMP,
+    "Age" TINYINT,
+    "Sex" TINYINT,
+    "Income" TINYINT,
+    "Interests" SMALLINT,
+    "Robotness" TINYINT,
+    "RemoteIP" INTEGER,
+    "WindowName" INTEGER,
+    "OpenerName" INTEGER,
+    "HistoryLength" SMALLINT,
+    "BrowserLanguage" TEXT(16),
+    "BrowserCountry" TEXT(16),
+    "SocialNetwork" TEXT,
+    "SocialAction" TEXT,
+    "HTTPError" SMALLINT,
+    "SendTiming" INTEGER,
+    "DNSTiming" INTEGER,
+    "ConnectTiming" INTEGER,
+    "ResponseStartTiming" INTEGER,
+    "ResponseEndTiming" INTEGER,
+    "FetchTiming" INTEGER,
+    "SocialSourceNetworkID" TINYINT,
+    "SocialSourcePage" TEXT,
+    "ParamPrice" BIGINT,
+    "ParamOrderID" TEXT,
+    "ParamCurrency" TEXT,
+    "ParamCurrencyID" SMALLINT,
+    "OpenstatServiceName" TEXT,
+    "OpenstatCampaignID" TEXT,
+    "OpenstatAdID" TEXT,
+    "OpenstatSourceID" TEXT,
+    "UTMSource" TEXT,
+    "UTMMedium" TEXT,
+    "UTMCampaign" TEXT,
+    "UTMContent" TEXT,
+    "UTMTerm" TEXT,
+    "FromTag" TEXT,
+    "HasGCLID" TINYINT,
+    "RefererHash" BIGINT,
+    "URLHash" BIGINT,
+    "CLID" INTEGER
+);
+
+operation successful
+```
+
+```
+sql>SELECT * FROM hits;
++---------+------------+-------+-----------+-----------+-----------+-----------+----------+----------+--------+--------------+----+-----------+-----+---------+---------+-------------------+
+| WatchID | JavaEnable | Title | GoodEvent | EventTime | EventDate | CounterID | ClientIP | RegionID | UserID | CounterClass | OS | UserAgent | URL | Referer | Refresh | RefererCategoryID |>
++=========+============+=======+===========+===========+===========+===========+==========+==========+========+==============+====+===========+=====+=========+=========+===================+
++---------+------------+-------+-----------+-----------+-----------+-----------+----------+----------+--------+--------------+----+-----------+-----+---------+---------+-------------------+
+0 tuples !88 columns dropped!
+note: to disable dropping columns and/or truncating fields use \w-1
+```
+
+Perfect.
+
+https://www.monetdb.org/Documentation/Reference/MonetDBClientApplications/mclient - broken link on page https://www.monetdb.org/Documentation/ServerAdministration/QueryTiming
+
+
+COPY command: https://www.monetdb.org/Documentation/SQLreference/SQLSyntaxOverview#COPY_INTO_FROM
+
+`COPY INTO hits FROM '/home/milovidov/example_datasets/hits_100m_obfuscated.csv' USING DELIMITERS ',', '\n', '"';`
+
+```
+sql>COPY INTO hits FROM '/home/milovidov/example_datasets/hits_100m_obfuscated.csv' USING DELIMITERS ',', '\n', '"';
+Failed to import table 'hits', line 55390 field Robotness 'tinyint' expected in '-128'
+```
+
+TINYINT - 8 bit signed integer between -127 and 127
+The smallest negative number is not supported by any of the types.
+
+It makes impossible to store the values of 64bit identifiers in BIGINT.
+
+Maybe it's a trick to optimize NULLs?
+
+Let's just cheat and add one to all the most negative numbers while exporting dataset from ClickHouse...
+
+```
+SELECT 
+    toInt64(WatchID) = -9223372036854775808 ? -9223372036854775807 : toInt64(WatchID), 
+    toInt8(JavaEnable) = -128 ? -127 : toInt8(JavaEnable), 
+    toValidUTF8(toString(Title)), 
+    toInt16(GoodEvent) = -32768 ? -32767 : toInt16(GoodEvent), 
+    EventTime, 
+    EventDate, 
+    toInt32(CounterID) = -2147483648 ? -2147483647 : toInt32(CounterID), 
+    toInt32(ClientIP) = -2147483648 ? -2147483647 : toInt32(ClientIP), 
+    toInt32(RegionID) = -2147483648 ? -2147483647 : toInt32(RegionID), 
+    toInt64(UserID) = -9223372036854775808 ? -9223372036854775807 : toInt64(UserID), 
+    toInt8(CounterClass) = -128 ? -127 : toInt8(CounterClass), 
+    toInt8(OS) = -128 ? -127 : toInt8(OS), 
+    toInt8(UserAgent) = -128 ? -127 : toInt8(UserAgent), 
+    toValidUTF8(toString(URL)), 
+    toValidUTF8(toString(Referer)), 
+    toInt8(Refresh) = -128 ? -127 : toInt8(Refresh), 
+    toInt16(RefererCategoryID) = -32768 ? -32767 : toInt16(RefererCategoryID), 
+    toInt32(RefererRegionID) = -2147483648 ? -2147483647 : toInt32(RefererRegionID), 
+    toInt16(URLCategoryID) = -32768 ? -32767 : toInt16(URLCategoryID), 
+    toInt32(URLRegionID) = -2147483648 ? -2147483647 : toInt32(URLRegionID), 
+    toInt16(ResolutionWidth) = -32768 ? -32767 : toInt16(ResolutionWidth), 
+    toInt16(ResolutionHeight) = -32768 ? -32767 : toInt16(ResolutionHeight), 
+    toInt8(ResolutionDepth) = -128 ? -127 : toInt8(ResolutionDepth), 
+    toInt8(FlashMajor) = -128 ? -127 : toInt8(FlashMajor), 
+    toInt8(FlashMinor) = -128 ? -127 : toInt8(FlashMinor), 
+    toValidUTF8(toString(FlashMinor2)), 
+    toInt8(NetMajor) = -128 ? -127 : toInt8(NetMajor), 
+    toInt8(NetMinor) = -128 ? -127 : toInt8(NetMinor), 
+    toInt16(UserAgentMajor) = -32768 ? -32767 : toInt16(UserAgentMajor), 
+    toValidUTF8(toString(UserAgentMinor)), 
+    toInt8(CookieEnable) = -128 ? -127 : toInt8(CookieEnable), 
+    toInt8(JavascriptEnable) = -128 ? -127 : toInt8(JavascriptEnable), 
+    toInt8(IsMobile) = -128 ? -127 : toInt8(IsMobile), 
+    toInt8(MobilePhone) = -128 ? -127 : toInt8(MobilePhone), 
+    toValidUTF8(toString(MobilePhoneModel)), 
+    toValidUTF8(toString(Params)), 
+    toInt32(IPNetworkID) = -2147483648 ? -2147483647 : toInt32(IPNetworkID), 
+    toInt8(TraficSourceID) = -128 ? -127 : toInt8(TraficSourceID), 
+    toInt16(SearchEngineID) = -32768 ? -32767 : toInt16(SearchEngineID), 
+    toValidUTF8(toString(SearchPhrase)), 
+    toInt8(AdvEngineID) = -128 ? -127 : toInt8(AdvEngineID), 
+    toInt8(IsArtifical) = -128 ? -127 : toInt8(IsArtifical), 
+    toInt16(WindowClientWidth) = -32768 ? -32767 : toInt16(WindowClientWidth), 
+    toInt16(WindowClientHeight) = -32768 ? -32767 : toInt16(WindowClientHeight), 
+    toInt16(ClientTimeZone) = -32768 ? -32767 : toInt16(ClientTimeZone), 
+    ClientEventTime, 
+    toInt8(SilverlightVersion1) = -128 ? -127 : toInt8(SilverlightVersion1), 
+    toInt8(SilverlightVersion2) = -128 ? -127 : toInt8(SilverlightVersion2), 
+    toInt32(SilverlightVersion3) = -2147483648 ? -2147483647 : toInt32(SilverlightVersion3), 
+    toInt16(SilverlightVersion4) = -32768 ? -32767 : toInt16(SilverlightVersion4), 
+    toValidUTF8(toString(PageCharset)), 
+    toInt32(CodeVersion) = -2147483648 ? -2147483647 : toInt32(CodeVersion), 
+    toInt8(IsLink) = -128 ? -127 : toInt8(IsLink), 
+    toInt8(IsDownload) = -128 ? -127 : toInt8(IsDownload), 
+    toInt8(IsNotBounce) = -128 ? -127 : toInt8(IsNotBounce), 
+    toInt64(FUniqID) = -9223372036854775808 ? -9223372036854775807 : toInt64(FUniqID), 
+    toValidUTF8(toString(OriginalURL)), 
+    toInt32(HID) = -2147483648 ? -2147483647 : toInt32(HID), 
+    toInt8(IsOldCounter) = -128 ? -127 : toInt8(IsOldCounter), 
+    toInt8(IsEvent) = -128 ? -127 : toInt8(IsEvent), 
+    toInt8(IsParameter) = -128 ? -127 : toInt8(IsParameter), 
+    toInt8(DontCountHits) = -128 ? -127 : toInt8(DontCountHits), 
+    toInt8(WithHash) = -128 ? -127 : toInt8(WithHash), 
+    toValidUTF8(toString(HitColor)), 
+    LocalEventTime, 
+    toInt8(Age) = -128 ? -127 : toInt8(Age), 
+    toInt8(Sex) = -128 ? -127 : toInt8(Sex), 
+    toInt8(Income) = -128 ? -127 : toInt8(Income), 
+    toInt16(Interests) = -32768 ? -32767 : toInt16(Interests), 
+    toInt8(Robotness) = -128 ? -127 : toInt8(Robotness), 
+    toInt32(RemoteIP) = -2147483648 ? -2147483647 : toInt32(RemoteIP), 
+    toInt32(WindowName) = -2147483648 ? -2147483647 : toInt32(WindowName), 
+    toInt32(OpenerName) = -2147483648 ? -2147483647 : toInt32(OpenerName), 
+    toInt16(HistoryLength) = -32768 ? -32767 : toInt16(HistoryLength), 
+    toValidUTF8(toString(BrowserLanguage)), 
+    toValidUTF8(toString(BrowserCountry)), 
+    toValidUTF8(toString(SocialNetwork)), 
+    toValidUTF8(toString(SocialAction)), 
+    toInt16(HTTPError) = -32768 ? -32767 : toInt16(HTTPError), 
+    toInt32(SendTiming) = -2147483648 ? -2147483647 : toInt32(SendTiming), 
+    toInt32(DNSTiming) = -2147483648 ? -2147483647 : toInt32(DNSTiming), 
+    toInt32(ConnectTiming) = -2147483648 ? -2147483647 : toInt32(ConnectTiming), 
+    toInt32(ResponseStartTiming) = -2147483648 ? -2147483647 : toInt32(ResponseStartTiming), 
+    toInt32(ResponseEndTiming) = -2147483648 ? -2147483647 : toInt32(ResponseEndTiming), 
+    toInt32(FetchTiming) = -2147483648 ? -2147483647 : toInt32(FetchTiming), 
+    toInt8(SocialSourceNetworkID) = -128 ? -127 : toInt8(SocialSourceNetworkID), 
+    toValidUTF8(toString(SocialSourcePage)), 
+    toInt64(ParamPrice) = -9223372036854775808 ? -9223372036854775807 : toInt64(ParamPrice), 
+    toValidUTF8(toString(ParamOrderID)), 
+    toValidUTF8(toString(ParamCurrency)), 
+    toInt16(ParamCurrencyID) = -32768 ? -32767 : toInt16(ParamCurrencyID), 
+    toValidUTF8(toString(OpenstatServiceName)), 
+    toValidUTF8(toString(OpenstatCampaignID)), 
+    toValidUTF8(toString(OpenstatAdID)), 
+    toValidUTF8(toString(OpenstatSourceID)), 
+    toValidUTF8(toString(UTMSource)), 
+    toValidUTF8(toString(UTMMedium)), 
+    toValidUTF8(toString(UTMCampaign)), 
+    toValidUTF8(toString(UTMContent)), 
+    toValidUTF8(toString(UTMTerm)), 
+    toValidUTF8(toString(FromTag)), 
+    toInt8(HasGCLID) = -128 ? -127 : toInt8(HasGCLID), 
+    toInt64(RefererHash) = -9223372036854775808 ? -9223372036854775807 : toInt64(RefererHash), 
+    toInt64(URLHash) = -9223372036854775808 ? -9223372036854775807 : toInt64(URLHash), 
+    toInt32(CLID) = -2147483648 ? -2147483647 : toInt32(CLID)
+FROM hits_100m_obfuscated
+INTO OUTFILE '/home/milovidov/example_datasets/hits_100m_obfuscated_monetdb.csv'
+FORMAT CSV;
+```
+
+Try №2.
+
+`COPY INTO hits FROM '/home/milovidov/example_datasets/hits_100m_obfuscated_monetdb.csv' USING DELIMITERS ',', '\n', '"';`
+
+
+```
+sql>COPY INTO hits FROM '/home/milovidov/example_datasets/hits_100m_obfuscated_monetdb.csv' USING DELIMITERS ',', '\n', '"';
+Failed to import table 'hits', line 1: column 106: Leftover data '1526320043,139,7122783580357023164,1,44,2,"http://smeshariki.ru/a-albumshowtopic/8940180","http://video.yandex.ru/yandex.ru/site=&airbag=&srt=0&fu=0",0,0,20,0,22,1917,879,37,15,13,"800",0,0,10,"sO",1,1,0,0,"","",3626245,-1,0,"",0,0,746,459,135,"2013-07-21 15:14:16",0,0,0,0,"windows",1,0,0,0,8675577400349020325,"",1034597214,0,0,0,0,0,"5","2013-07-21 11:14:27",31,1,2,3557,5,1782490839,-1,-1,-1,"S0","�
+                                                                 "
+```
+
+Looks like it does not support newlines inside string literals.
+
+Let's dig into https://www.monetdb.org/Documentation/ServerAdministration/LoadingBulkData/CSVBulkLoads
+
+First, it's better to specify the number of records:
+`COPY 100000000 RECORDS INTO hits FROM '/home/milovidov/example_datasets/hits_100m_obfuscated_monetdb.csv' USING DELIMITERS ',', '\n', '"';`
+
+> Quote characters in quoted fields may be escaped with a backslash.
+
+Ok, then it's TSV, not CSV. Let's create TSV dump...
+
+
+```
+SELECT 
+    toInt64(WatchID) = -9223372036854775808 ? -9223372036854775807 : toInt64(WatchID), 
+    toInt8(JavaEnable) = -128 ? -127 : toInt8(JavaEnable), 
+    toValidUTF8(toString(Title)), 
+    toInt16(GoodEvent) = -32768 ? -32767 : toInt16(GoodEvent), 
+    EventTime, 
+    EventDate, 
+    toInt32(CounterID) = -2147483648 ? -2147483647 : toInt32(CounterID), 
+    toInt32(ClientIP) = -2147483648 ? -2147483647 : toInt32(ClientIP), 
+    toInt32(RegionID) = -2147483648 ? -2147483647 : toInt32(RegionID), 
+    toInt64(UserID) = -9223372036854775808 ? -9223372036854775807 : toInt64(UserID), 
+    toInt8(CounterClass) = -128 ? -127 : toInt8(CounterClass), 
+    toInt8(OS) = -128 ? -127 : toInt8(OS), 
+    toInt8(UserAgent) = -128 ? -127 : toInt8(UserAgent), 
+    toValidUTF8(toString(URL)), 
+    toValidUTF8(toString(Referer)), 
+    toInt8(Refresh) = -128 ? -127 : toInt8(Refresh), 
+    toInt16(RefererCategoryID) = -32768 ? -32767 : toInt16(RefererCategoryID), 
+    toInt32(RefererRegionID) = -2147483648 ? -2147483647 : toInt32(RefererRegionID), 
+    toInt16(URLCategoryID) = -32768 ? -32767 : toInt16(URLCategoryID), 
+    toInt32(URLRegionID) = -2147483648 ? -2147483647 : toInt32(URLRegionID), 
+    toInt16(ResolutionWidth) = -32768 ? -32767 : toInt16(ResolutionWidth), 
+    toInt16(ResolutionHeight) = -32768 ? -32767 : toInt16(ResolutionHeight), 
+    toInt8(ResolutionDepth) = -128 ? -127 : toInt8(ResolutionDepth), 
+    toInt8(FlashMajor) = -128 ? -127 : toInt8(FlashMajor), 
+    toInt8(FlashMinor) = -128 ? -127 : toInt8(FlashMinor), 
+    toValidUTF8(toString(FlashMinor2)), 
+    toInt8(NetMajor) = -128 ? -127 : toInt8(NetMajor), 
+    toInt8(NetMinor) = -128 ? -127 : toInt8(NetMinor), 
+    toInt16(UserAgentMajor) = -32768 ? -32767 : toInt16(UserAgentMajor), 
+    toValidUTF8(toString(UserAgentMinor)), 
+    toInt8(CookieEnable) = -128 ? -127 : toInt8(CookieEnable), 
+    toInt8(JavascriptEnable) = -128 ? -127 : toInt8(JavascriptEnable), 
+    toInt8(IsMobile) = -128 ? -127 : toInt8(IsMobile), 
+    toInt8(MobilePhone) = -128 ? -127 : toInt8(MobilePhone), 
+    toValidUTF8(toString(MobilePhoneModel)), 
+    toValidUTF8(toString(Params)), 
+    toInt32(IPNetworkID) = -2147483648 ? -2147483647 : toInt32(IPNetworkID), 
+    toInt8(TraficSourceID) = -128 ? -127 : toInt8(TraficSourceID), 
+    toInt16(SearchEngineID) = -32768 ? -32767 : toInt16(SearchEngineID), 
+    toValidUTF8(toString(SearchPhrase)), 
+    toInt8(AdvEngineID) = -128 ? -127 : toInt8(AdvEngineID), 
+    toInt8(IsArtifical) = -128 ? -127 : toInt8(IsArtifical), 
+    toInt16(WindowClientWidth) = -32768 ? -32767 : toInt16(WindowClientWidth), 
+    toInt16(WindowClientHeight) = -32768 ? -32767 : toInt16(WindowClientHeight), 
+    toInt16(ClientTimeZone) = -32768 ? -32767 : toInt16(ClientTimeZone), 
+    ClientEventTime, 
+    toInt8(SilverlightVersion1) = -128 ? -127 : toInt8(SilverlightVersion1), 
+    toInt8(SilverlightVersion2) = -128 ? -127 : toInt8(SilverlightVersion2), 
+    toInt32(SilverlightVersion3) = -2147483648 ? -2147483647 : toInt32(SilverlightVersion3), 
+    toInt16(SilverlightVersion4) = -32768 ? -32767 : toInt16(SilverlightVersion4), 
+    toValidUTF8(toString(PageCharset)), 
+    toInt32(CodeVersion) = -2147483648 ? -2147483647 : toInt32(CodeVersion), 
+    toInt8(IsLink) = -128 ? -127 : toInt8(IsLink), 
+    toInt8(IsDownload) = -128 ? -127 : toInt8(IsDownload), 
+    toInt8(IsNotBounce) = -128 ? -127 : toInt8(IsNotBounce), 
+    toInt64(FUniqID) = -9223372036854775808 ? -9223372036854775807 : toInt64(FUniqID), 
+    toValidUTF8(toString(OriginalURL)), 
+    toInt32(HID) = -2147483648 ? -2147483647 : toInt32(HID), 
+    toInt8(IsOldCounter) = -128 ? -127 : toInt8(IsOldCounter), 
+    toInt8(IsEvent) = -128 ? -127 : toInt8(IsEvent), 
+    toInt8(IsParameter) = -128 ? -127 : toInt8(IsParameter), 
+    toInt8(DontCountHits) = -128 ? -127 : toInt8(DontCountHits), 
+    toInt8(WithHash) = -128 ? -127 : toInt8(WithHash), 
+    toValidUTF8(toString(HitColor)), 
+    LocalEventTime, 
+    toInt8(Age) = -128 ? -127 : toInt8(Age), 
+    toInt8(Sex) = -128 ? -127 : toInt8(Sex), 
+    toInt8(Income) = -128 ? -127 : toInt8(Income), 
+    toInt16(Interests) = -32768 ? -32767 : toInt16(Interests), 
+    toInt8(Robotness) = -128 ? -127 : toInt8(Robotness), 
+    toInt32(RemoteIP) = -2147483648 ? -2147483647 : toInt32(RemoteIP), 
+    toInt32(WindowName) = -2147483648 ? -2147483647 : toInt32(WindowName), 
+    toInt32(OpenerName) = -2147483648 ? -2147483647 : toInt32(OpenerName), 
+    toInt16(HistoryLength) = -32768 ? -32767 : toInt16(HistoryLength), 
+    toValidUTF8(toString(BrowserLanguage)), 
+    toValidUTF8(toString(BrowserCountry)), 
+    toValidUTF8(toString(SocialNetwork)), 
+    toValidUTF8(toString(SocialAction)), 
+    toInt16(HTTPError) = -32768 ? -32767 : toInt16(HTTPError), 
+    toInt32(SendTiming) = -2147483648 ? -2147483647 : toInt32(SendTiming), 
+    toInt32(DNSTiming) = -2147483648 ? -2147483647 : toInt32(DNSTiming), 
+    toInt32(ConnectTiming) = -2147483648 ? -2147483647 : toInt32(ConnectTiming), 
+    toInt32(ResponseStartTiming) = -2147483648 ? -2147483647 : toInt32(ResponseStartTiming), 
+    toInt32(ResponseEndTiming) = -2147483648 ? -2147483647 : toInt32(ResponseEndTiming), 
+    toInt32(FetchTiming) = -2147483648 ? -2147483647 : toInt32(FetchTiming), 
+    toInt8(SocialSourceNetworkID) = -128 ? -127 : toInt8(SocialSourceNetworkID), 
+    toValidUTF8(toString(SocialSourcePage)), 
+    toInt64(ParamPrice) = -9223372036854775808 ? -9223372036854775807 : toInt64(ParamPrice), 
+    toValidUTF8(toString(ParamOrderID)), 
+    toValidUTF8(toString(ParamCurrency)), 
+    toInt16(ParamCurrencyID) = -32768 ? -32767 : toInt16(ParamCurrencyID), 
+    toValidUTF8(toString(OpenstatServiceName)), 
+    toValidUTF8(toString(OpenstatCampaignID)), 
+    toValidUTF8(toString(OpenstatAdID)), 
+    toValidUTF8(toString(OpenstatSourceID)), 
+    toValidUTF8(toString(UTMSource)), 
+    toValidUTF8(toString(UTMMedium)), 
+    toValidUTF8(toString(UTMCampaign)), 
+    toValidUTF8(toString(UTMContent)), 
+    toValidUTF8(toString(UTMTerm)), 
+    toValidUTF8(toString(FromTag)), 
+    toInt8(HasGCLID) = -128 ? -127 : toInt8(HasGCLID), 
+    toInt64(RefererHash) = -9223372036854775808 ? -9223372036854775807 : toInt64(RefererHash), 
+    toInt64(URLHash) = -9223372036854775808 ? -9223372036854775807 : toInt64(URLHash), 
+    toInt32(CLID) = -2147483648 ? -2147483647 : toInt32(CLID)
+FROM hits_100m_obfuscated
+INTO OUTFILE '/home/milovidov/example_datasets/hits_100m_obfuscated_monetdb.tsv'
+FORMAT TSV;
+```
+
+MonetDB client lacks history.
+
+`mclient -u monetdb -d test --timer=clock`
+
+`COPY 100000000 RECORDS INTO hits FROM '/home/milovidov/example_datasets/hits_100m_obfuscated_monetdb.tsv' USING DELIMITERS '\t', '\n', '';`
+
+```
+sql>COPY 100000000 RECORDS INTO hits FROM '/home/milovidov/example_datasets/hits_100m_obfuscated_monetdb.tsv' USING DELIMITERS '\t', '\n', '';
+Failed to import table 'hits', 
+clk: 1.200 sec
+```
+
+Now it gives incomprehensible error...
+Looks like it because of 100000000 RECORDS.
+Let's try without it.
+
+`COPY INTO hits FROM '/home/milovidov/example_datasets/hits_100m_obfuscated_monetdb.tsv' USING DELIMITERS '\t', '\n', '';`
+
+Ok, it appeared to work...
+
+`top -d0.5`
+
+`mserver5` consumes about 1 CPU core but with strange pauses.
+
+```
+sql>COPY INTO hits FROM '/home/milovidov/example_datasets/hits_100m_obfuscated_monetdb.tsv' USING DELIMITERS '\t', '\n', '';
+Failed to import table 'hits', 
+clk: 2:31 min
+```
+
+It does not work and there is no explanation available.
+
+When I type Ctrl+D in CLI, it does not output a line feed into terminal.
+
+Let's google it.
+https://www.monetdb.org/pipermail/users-list/2013-November/007014.html
+
+Probably it because of no quoting for strings.
+Let's create a dump with `|` as a separator, `"` as string quote and C-style escaping.
+But it's impossible to create dump in that format in ClickHouse.
+
+Let's consider using binary format...
+
+Ok, before we consider binary format, maybe we need to write character literals as E'\t' instead of '\t'?
+
+`mclient` does not have an option to specify password in command line, it's annoying.
+PS. I found how to solve it here: https://www.monetdb.org/Documentation/ServerAdministration/ServerSetupAndConfiguration
+
+```
+COPY INTO hits FROM '/home/milovidov/example_datasets/hits_100m_obfuscated_monetdb.tsv' USING DELIMITERS E'\t', E'\n', E'';
+```
+
+It does not work either:
+
+```
+sql>COPY INTO hits FROM '/home/milovidov/example_datasets/hits_100m_obfuscated_monetdb.tsv' USING DELIMITERS E'\t', E'\n', E'';
+Failed to import table 'hits', Failed to extend the BAT, perhaps disk full
+clk: 1:17 min
+```
+
+Let's try binary import. But it would not work:
+
+> For variable length strings, the file must have one C-based string value per line, terminated by a newline, and it is processed without escape character conversion. Fixed length strings are handled the same way. MonetDB assumes that all files are aligned, i.e. the i-th value in each file corresponds to the i-th record in the table.
+
+According to the docs, there is no way to import strings with line feed characters.
+
+BTW, the favicon of the MonetDB website makes an impression that the web page is constantly loading (it looks like a spinner).
+
+Let's cheat again and replace all line feeds in strings to whitespaces and all double quotes to single quotes.
+
+```
+SELECT 
+    toInt64(WatchID) = -9223372036854775808 ? -9223372036854775807 : toInt64(WatchID), 
+    toInt8(JavaEnable) = -128 ? -127 : toInt8(JavaEnable), 
+    replaceAll(replaceAll(toValidUTF8(toString(Title)), '\n', ' '), '"', '\''), 
+    toInt16(GoodEvent) = -32768 ? -32767 : toInt16(GoodEvent), 
+    EventTime, 
+    EventDate, 
+    toInt32(CounterID) = -2147483648 ? -2147483647 : toInt32(CounterID), 
+    toInt32(ClientIP) = -2147483648 ? -2147483647 : toInt32(ClientIP), 
+    toInt32(RegionID) = -2147483648 ? -2147483647 : toInt32(RegionID), 
+    toInt64(UserID) = -9223372036854775808 ? -9223372036854775807 : toInt64(UserID), 
+    toInt8(CounterClass) = -128 ? -127 : toInt8(CounterClass), 
+    toInt8(OS) = -128 ? -127 : toInt8(OS), 
+    toInt8(UserAgent) = -128 ? -127 : toInt8(UserAgent), 
+    replaceAll(replaceAll(toValidUTF8(toString(URL)), '\n', ' '), '"', '\''), 
+    replaceAll(replaceAll(toValidUTF8(toString(Referer)), '\n', ' '), '"', '\''), 
+    toInt8(Refresh) = -128 ? -127 : toInt8(Refresh), 
+    toInt16(RefererCategoryID) = -32768 ? -32767 : toInt16(RefererCategoryID), 
+    toInt32(RefererRegionID) = -2147483648 ? -2147483647 : toInt32(RefererRegionID), 
+    toInt16(URLCategoryID) = -32768 ? -32767 : toInt16(URLCategoryID), 
+    toInt32(URLRegionID) = -2147483648 ? -2147483647 : toInt32(URLRegionID), 
+    toInt16(ResolutionWidth) = -32768 ? -32767 : toInt16(ResolutionWidth), 
+    toInt16(ResolutionHeight) = -32768 ? -32767 : toInt16(ResolutionHeight), 
+    toInt8(ResolutionDepth) = -128 ? -127 : toInt8(ResolutionDepth), 
+    toInt8(FlashMajor) = -128 ? -127 : toInt8(FlashMajor), 
+    toInt8(FlashMinor) = -128 ? -127 : toInt8(FlashMinor), 
+    replaceAll(replaceAll(toValidUTF8(toString(FlashMinor2)), '\n', ' '), '"', '\''), 
+    toInt8(NetMajor) = -128 ? -127 : toInt8(NetMajor), 
+    toInt8(NetMinor) = -128 ? -127 : toInt8(NetMinor), 
+    toInt16(UserAgentMajor) = -32768 ? -32767 : toInt16(UserAgentMajor), 
+    replaceAll(replaceAll(toValidUTF8(toString(UserAgentMinor)), '\n', ' '), '"', '\''), 
+    toInt8(CookieEnable) = -128 ? -127 : toInt8(CookieEnable), 
+    toInt8(JavascriptEnable) = -128 ? -127 : toInt8(JavascriptEnable), 
+    toInt8(IsMobile) = -128 ? -127 : toInt8(IsMobile), 
+    toInt8(MobilePhone) = -128 ? -127 : toInt8(MobilePhone), 
+    replaceAll(replaceAll(toValidUTF8(toString(MobilePhoneModel)), '\n', ' '), '"', '\''), 
+    replaceAll(replaceAll(toValidUTF8(toString(Params)), '\n', ' '), '"', '\''), 
+    toInt32(IPNetworkID) = -2147483648 ? -2147483647 : toInt32(IPNetworkID), 
+    toInt8(TraficSourceID) = -128 ? -127 : toInt8(TraficSourceID), 
+    toInt16(SearchEngineID) = -32768 ? -32767 : toInt16(SearchEngineID), 
+    replaceAll(replaceAll(toValidUTF8(toString(SearchPhrase)), '\n', ' '), '"', '\''), 
+    toInt8(AdvEngineID) = -128 ? -127 : toInt8(AdvEngineID), 
+    toInt8(IsArtifical) = -128 ? -127 : toInt8(IsArtifical), 
+    toInt16(WindowClientWidth) = -32768 ? -32767 : toInt16(WindowClientWidth), 
+    toInt16(WindowClientHeight) = -32768 ? -32767 : toInt16(WindowClientHeight), 
+    toInt16(ClientTimeZone) = -32768 ? -32767 : toInt16(ClientTimeZone), 
+    ClientEventTime, 
+    toInt8(SilverlightVersion1) = -128 ? -127 : toInt8(SilverlightVersion1), 
+    toInt8(SilverlightVersion2) = -128 ? -127 : toInt8(SilverlightVersion2), 
+    toInt32(SilverlightVersion3) = -2147483648 ? -2147483647 : toInt32(SilverlightVersion3), 
+    toInt16(SilverlightVersion4) = -32768 ? -32767 : toInt16(SilverlightVersion4), 
+    replaceAll(replaceAll(toValidUTF8(toString(PageCharset)), '\n', ' '), '"', '\''), 
+    toInt32(CodeVersion) = -2147483648 ? -2147483647 : toInt32(CodeVersion), 
+    toInt8(IsLink) = -128 ? -127 : toInt8(IsLink), 
+    toInt8(IsDownload) = -128 ? -127 : toInt8(IsDownload), 
+    toInt8(IsNotBounce) = -128 ? -127 : toInt8(IsNotBounce), 
+    toInt64(FUniqID) = -9223372036854775808 ? -9223372036854775807 : toInt64(FUniqID), 
+    replaceAll(replaceAll(toValidUTF8(toString(OriginalURL)), '\n', ' '), '"', '\''), 
+    toInt32(HID) = -2147483648 ? -2147483647 : toInt32(HID), 
+    toInt8(IsOldCounter) = -128 ? -127 : toInt8(IsOldCounter), 
+    toInt8(IsEvent) = -128 ? -127 : toInt8(IsEvent), 
+    toInt8(IsParameter) = -128 ? -127 : toInt8(IsParameter), 
+    toInt8(DontCountHits) = -128 ? -127 : toInt8(DontCountHits), 
+    toInt8(WithHash) = -128 ? -127 : toInt8(WithHash), 
+    replaceAll(replaceAll(toValidUTF8(toString(HitColor)), '\n', ' '), '"', '\''), 
+    LocalEventTime, 
+    toInt8(Age) = -128 ? -127 : toInt8(Age), 
+    toInt8(Sex) = -128 ? -127 : toInt8(Sex), 
+    toInt8(Income) = -128 ? -127 : toInt8(Income), 
+    toInt16(Interests) = -32768 ? -32767 : toInt16(Interests), 
+    toInt8(Robotness) = -128 ? -127 : toInt8(Robotness), 
+    toInt32(RemoteIP) = -2147483648 ? -2147483647 : toInt32(RemoteIP), 
+    toInt32(WindowName) = -2147483648 ? -2147483647 : toInt32(WindowName), 
+    toInt32(OpenerName) = -2147483648 ? -2147483647 : toInt32(OpenerName), 
+    toInt16(HistoryLength) = -32768 ? -32767 : toInt16(HistoryLength), 
+    replaceAll(replaceAll(toValidUTF8(toString(BrowserLanguage)), '\n', ' '), '"', '\''), 
+    replaceAll(replaceAll(toValidUTF8(toString(BrowserCountry)), '\n', ' '), '"', '\''), 
+    replaceAll(replaceAll(toValidUTF8(toString(SocialNetwork)), '\n', ' '), '"', '\''), 
+    replaceAll(replaceAll(toValidUTF8(toString(SocialAction)), '\n', ' '), '"', '\''), 
+    toInt16(HTTPError) = -32768 ? -32767 : toInt16(HTTPError), 
+    toInt32(SendTiming) = -2147483648 ? -2147483647 : toInt32(SendTiming), 
+    toInt32(DNSTiming) = -2147483648 ? -2147483647 : toInt32(DNSTiming), 
+    toInt32(ConnectTiming) = -2147483648 ? -2147483647 : toInt32(ConnectTiming), 
+    toInt32(ResponseStartTiming) = -2147483648 ? -2147483647 : toInt32(ResponseStartTiming), 
+    toInt32(ResponseEndTiming) = -2147483648 ? -2147483647 : toInt32(ResponseEndTiming), 
+    toInt32(FetchTiming) = -2147483648 ? -2147483647 : toInt32(FetchTiming), 
+    toInt8(SocialSourceNetworkID) = -128 ? -127 : toInt8(SocialSourceNetworkID), 
+    replaceAll(replaceAll(toValidUTF8(toString(SocialSourcePage)), '\n', ' '), '"', '\''), 
+    toInt64(ParamPrice) = -9223372036854775808 ? -9223372036854775807 : toInt64(ParamPrice), 
+    replaceAll(replaceAll(toValidUTF8(toString(ParamOrderID)), '\n', ' '), '"', '\''), 
+    replaceAll(replaceAll(toValidUTF8(toString(ParamCurrency)), '\n', ' '), '"', '\''), 
+    toInt16(ParamCurrencyID) = -32768 ? -32767 : toInt16(ParamCurrencyID), 
+    replaceAll(replaceAll(toValidUTF8(toString(OpenstatServiceName)), '\n', ' '), '"', '\''), 
+    replaceAll(replaceAll(toValidUTF8(toString(OpenstatCampaignID)), '\n', ' '), '"', '\''), 
+    replaceAll(replaceAll(toValidUTF8(toString(OpenstatAdID)), '\n', ' '), '"', '\''), 
+    replaceAll(replaceAll(toValidUTF8(toString(OpenstatSourceID)), '\n', ' '), '"', '\''), 
+    replaceAll(replaceAll(toValidUTF8(toString(UTMSource)), '\n', ' '), '"', '\''), 
+    replaceAll(replaceAll(toValidUTF8(toString(UTMMedium)), '\n', ' '), '"', '\''), 
+    replaceAll(replaceAll(toValidUTF8(toString(UTMCampaign)), '\n', ' '), '"', '\''), 
+    replaceAll(replaceAll(toValidUTF8(toString(UTMContent)), '\n', ' '), '"', '\''), 
+    replaceAll(replaceAll(toValidUTF8(toString(UTMTerm)), '\n', ' '), '"', '\''), 
+    replaceAll(replaceAll(toValidUTF8(toString(FromTag)), '\n', ' '), '"', '\''), 
+    toInt8(HasGCLID) = -128 ? -127 : toInt8(HasGCLID), 
+    toInt64(RefererHash) = -9223372036854775808 ? -9223372036854775807 : toInt64(RefererHash), 
+    toInt64(URLHash) = -9223372036854775808 ? -9223372036854775807 : toInt64(URLHash), 
+    toInt32(CLID) = -2147483648 ? -2147483647 : toInt32(CLID)
+FROM hits_100m_obfuscated
+INTO OUTFILE '/home/milovidov/example_datasets/hits_100m_obfuscated_monetdb.csv'
+FORMAT CSV;
+```
+
+Another try:
+
+```
+COPY 100000000 RECORDS INTO hits FROM '/home/milovidov/example_datasets/hits_100m_obfuscated_monetdb.csv' USING DELIMITERS ',', '\n', '"';
+```
+
+Does not work.
+
+```
+Failed to import table 'hits', 
+clk: 1.091 sec
+```
+
+Another try:
+
+```
+COPY INTO hits FROM '/home/milovidov/example_datasets/hits_100m_obfuscated_monetdb.csv' USING DELIMITERS ',', '\n', '"';
+```
+
+Does not work.
+
+```
+Failed to import table 'hits', line 79128: record too long
+clk: 1.194 sec
+```
+
+Ok, the error message becomes more meaningful. Looks like MonetDB does not support long TEXT.
+Let's continue reading docs...
+
+> CLOB | TEXT | STRING | CHARACTER LARGE OBJECT: UTF-8 character string with unbounded length
+
+It must be unbounded!
+But maybe there is global limit on record length...
+
+https://www.monetdb.org/search/node?keys=record+length
+https://www.monetdb.org/search/node?keys=record+too+long
+
+The docs search did not give an answer. Let's search in the internet...
+
+https://www.monetdb.org/pipermail/users-list/2017-August/009930.html
+
+It's unclear what is the record numbering scheme - from 1 or from 0.
+But when I took at the records with
+
+```
+head -n79128 hits_100m_obfuscated_monetdb.csv | tail -n1
+head -n79129 hits_100m_obfuscated_monetdb.csv | tail -n1
+```
+
+they don't look too long.
+
+Ok, let's try to load data with "best effort" mode that MonetDB offers.
+
+```
+COPY INTO hits FROM '/home/milovidov/example_datasets/hits_100m_obfuscated_monetdb.csv' USING DELIMITERS ',', '\n', '"' BEST EFFORT;
+```
+
+But it loaded just 79127 rows. That's not what I need.
+
+```
+79127 affected rows
+clk: 1.684 sec
+```
+
+The TRUNCATE query works:
+
+```
+TRUNCATE TABLE hits;
+```
+
+Let's check if the record 79127 is really any longer than other records.
+
+Let's remove all length like `TEXT(16)` from CREATE TABLE statement...
+
+```
+DROP TABLE hits;
+
+CREATE TABLE hits
+(
+    "WatchID" BIGINT,
+    "JavaEnable" TINYINT,
+    "Title" TEXT,
+    "GoodEvent" SMALLINT,
+    "EventTime" TIMESTAMP,
+    "EventDate" Date,
+    "CounterID" INTEGER,
+    "ClientIP" INTEGER,
+    "RegionID" INTEGER,
+    "UserID" BIGINT,
+    "CounterClass" TINYINT,
+    "OS" TINYINT,
+    "UserAgent" TINYINT,
+    "URL" TEXT,
+    "Referer" TEXT,
+    "Refresh" TINYINT,
+    "RefererCategoryID" SMALLINT,
+    "RefererRegionID" INTEGER,
+    "URLCategoryID" SMALLINT,
+    "URLRegionID" INTEGER,
+    "ResolutionWidth" SMALLINT,
+    "ResolutionHeight" SMALLINT,
+    "ResolutionDepth" TINYINT,
+    "FlashMajor" TINYINT,
+    "FlashMinor" TINYINT,
+    "FlashMinor2" TEXT,
+    "NetMajor" TINYINT,
+    "NetMinor" TINYINT,
+    "UserAgentMajor" SMALLINT,
+    "UserAgentMinor" TEXT,
+    "CookieEnable" TINYINT,
+    "JavascriptEnable" TINYINT,
+    "IsMobile" TINYINT,
+    "MobilePhone" TINYINT,
+    "MobilePhoneModel" TEXT,
+    "Params" TEXT,
+    "IPNetworkID" INTEGER,
+    "TraficSourceID" TINYINT,
+    "SearchEngineID" SMALLINT,
+    "SearchPhrase" TEXT,
+    "AdvEngineID" TINYINT,
+    "IsArtifical" TINYINT,
+    "WindowClientWidth" SMALLINT,
+    "WindowClientHeight" SMALLINT,
+    "ClientTimeZone" SMALLINT,
+    "ClientEventTime" TIMESTAMP,
+    "SilverlightVersion1" TINYINT,
+    "SilverlightVersion2" TINYINT,
+    "SilverlightVersion3" INTEGER,
+    "SilverlightVersion4" SMALLINT,
+    "PageCharset" TEXT,
+    "CodeVersion" INTEGER,
+    "IsLink" TINYINT,
+    "IsDownload" TINYINT,
+    "IsNotBounce" TINYINT,
+    "FUniqID" BIGINT,
+    "OriginalURL" TEXT,
+    "HID" INTEGER,
+    "IsOldCounter" TINYINT,
+    "IsEvent" TINYINT,
+    "IsParameter" TINYINT,
+    "DontCountHits" TINYINT,
+    "WithHash" TINYINT,
+    "HitColor" TEXT,
+    "LocalEventTime" TIMESTAMP,
+    "Age" TINYINT,
+    "Sex" TINYINT,
+    "Income" TINYINT,
+    "Interests" SMALLINT,
+    "Robotness" TINYINT,
+    "RemoteIP" INTEGER,
+    "WindowName" INTEGER,
+    "OpenerName" INTEGER,
+    "HistoryLength" SMALLINT,
+    "BrowserLanguage" TEXT,
+    "BrowserCountry" TEXT,
+    "SocialNetwork" TEXT,
+    "SocialAction" TEXT,
+    "HTTPError" SMALLINT,
+    "SendTiming" INTEGER,
+    "DNSTiming" INTEGER,
+    "ConnectTiming" INTEGER,
+    "ResponseStartTiming" INTEGER,
+    "ResponseEndTiming" INTEGER,
+    "FetchTiming" INTEGER,
+    "SocialSourceNetworkID" TINYINT,
+    "SocialSourcePage" TEXT,
+    "ParamPrice" BIGINT,
+    "ParamOrderID" TEXT,
+    "ParamCurrency" TEXT,
+    "ParamCurrencyID" SMALLINT,
+    "OpenstatServiceName" TEXT,
+    "OpenstatCampaignID" TEXT,
+    "OpenstatAdID" TEXT,
+    "OpenstatSourceID" TEXT,
+    "UTMSource" TEXT,
+    "UTMMedium" TEXT,
+    "UTMCampaign" TEXT,
+    "UTMContent" TEXT,
+    "UTMTerm" TEXT,
+    "FromTag" TEXT,
+    "HasGCLID" TINYINT,
+    "RefererHash" BIGINT,
+    "URLHash" BIGINT,
+    "CLID" INTEGER
+);
+```
+
+```
+COPY INTO hits FROM '/home/milovidov/example_datasets/hits_100m_obfuscated_monetdb.csv' USING DELIMITERS ',', '\n', '"';
+```
+
+Unfortunately it did not help.
+
+```
+Failed to import table 'hits', line 79128: record too long
+clk: 1.224 sec
+```
+
+Let's check actual record lengths:
+
+```
+$ cat hits_100m_obfuscated_monetdb.csv | awk 'BEGIN { FS = "\n"; max_length = 0 } { ++num; l = length($1); if (l > max_length) { max_length = l; print l, "in line", num } }'
+588 in line 1
+705 in line 2
+786 in line 4
+788 in line 5
+913 in line 9
+917 in line 38
+996 in line 56
+1007 in line 113
+1008 in line 115
+1015 in line 183
+1147 in line 207
+1180 in line 654
+1190 in line 656
+1191 in line 795
+1446 in line 856
+1519 in line 1572
+1646 in line 1686
+1700 in line 3084
+1701 in line 3086
+2346 in line 4013
+2630 in line 8245
+3035 in line 8248
+3257 in line 8289
+3762 in line 8307
+5536 in line 8376
+5568 in line 71721
+6507 in line 92993
+6734 in line 163169
+7706 in line 473542
+8368 in line 2803973
+9375 in line 5433559
+```
+
+No, there is nothing special in line 79128.
+
+Let's try to load just a single line into MonetDB to figure out what is so special about this line.
+
+```
+head -n79128 hits_100m_obfuscated_monetdb.csv | tail -n1 > hits_100m_obfuscated_monetdb.csv1
+```
+
+```
+COPY INTO hits FROM '/home/milovidov/example_datasets/hits_100m_obfuscated_monetdb.csv1' USING DELIMITERS ',', '\n', '"';
+```
+
+`Failed to import table 'hits', line 1: incomplete record at end of file`
+
+Now we have another error.
+Ok. I understand that MonetDB is just parsing CSV with C-style escaping rules as TSV.
+
+I will try to stick with TSV.
+
+```
+COPY INTO hits FROM '/home/milovidov/example_datasets/hits_100m_obfuscated_monetdb.tsv' USING DELIMITERS '\t';
+```
+
+Nothing good happened, it failed after 2.5 minutes with incomprehensible error:
+
+```
+Failed to import table 'hits', 
+clk: 2:30 min
+```
+
+Let's replace all backslashes from CSV.
+
+```
+SELECT 
+    toInt64(WatchID) = -9223372036854775808 ? -9223372036854775807 : toInt64(WatchID), 
+    toInt8(JavaEnable) = -128 ? -127 : toInt8(JavaEnable), 
+    replaceAll(replaceAll(replaceAll(toValidUTF8(toString(Title)), '\n', ' '), '"', '\''), '\\', '/'), 
+    toInt16(GoodEvent) = -32768 ? -32767 : toInt16(GoodEvent), 
+    EventTime, 
+    EventDate, 
+    toInt32(CounterID) = -2147483648 ? -2147483647 : toInt32(CounterID), 
+    toInt32(ClientIP) = -2147483648 ? -2147483647 : toInt32(ClientIP), 
+    toInt32(RegionID) = -2147483648 ? -2147483647 : toInt32(RegionID), 
+    toInt64(UserID) = -9223372036854775808 ? -9223372036854775807 : toInt64(UserID), 
+    toInt8(CounterClass) = -128 ? -127 : toInt8(CounterClass), 
+    toInt8(OS) = -128 ? -127 : toInt8(OS), 
+    toInt8(UserAgent) = -128 ? -127 : toInt8(UserAgent), 
+    replaceAll(replaceAll(replaceAll(toValidUTF8(toString(URL)), '\n', ' '), '"', '\''), '\\', '/'), 
+    replaceAll(replaceAll(replaceAll(toValidUTF8(toString(Referer)), '\n', ' '), '"', '\''), '\\', '/'), 
+    toInt8(Refresh) = -128 ? -127 : toInt8(Refresh), 
+    toInt16(RefererCategoryID) = -32768 ? -32767 : toInt16(RefererCategoryID), 
+    toInt32(RefererRegionID) = -2147483648 ? -2147483647 : toInt32(RefererRegionID), 
+    toInt16(URLCategoryID) = -32768 ? -32767 : toInt16(URLCategoryID), 
+    toInt32(URLRegionID) = -2147483648 ? -2147483647 : toInt32(URLRegionID), 
+    toInt16(ResolutionWidth) = -32768 ? -32767 : toInt16(ResolutionWidth), 
+    toInt16(ResolutionHeight) = -32768 ? -32767 : toInt16(ResolutionHeight), 
+    toInt8(ResolutionDepth) = -128 ? -127 : toInt8(ResolutionDepth), 
+    toInt8(FlashMajor) = -128 ? -127 : toInt8(FlashMajor), 
+    toInt8(FlashMinor) = -128 ? -127 : toInt8(FlashMinor), 
+    replaceAll(replaceAll(replaceAll(toValidUTF8(toString(FlashMinor2)), '\n', ' '), '"', '\''), '\\', '/'), 
+    toInt8(NetMajor) = -128 ? -127 : toInt8(NetMajor), 
+    toInt8(NetMinor) = -128 ? -127 : toInt8(NetMinor), 
+    toInt16(UserAgentMajor) = -32768 ? -32767 : toInt16(UserAgentMajor), 
+    replaceAll(replaceAll(replaceAll(toValidUTF8(toString(UserAgentMinor)), '\n', ' '), '"', '\''), '\\', '/'), 
+    toInt8(CookieEnable) = -128 ? -127 : toInt8(CookieEnable), 
+    toInt8(JavascriptEnable) = -128 ? -127 : toInt8(JavascriptEnable), 
+    toInt8(IsMobile) = -128 ? -127 : toInt8(IsMobile), 
+    toInt8(MobilePhone) = -128 ? -127 : toInt8(MobilePhone), 
+    replaceAll(replaceAll(replaceAll(toValidUTF8(toString(MobilePhoneModel)), '\n', ' '), '"', '\''), '\\', '/'), 
+    replaceAll(replaceAll(replaceAll(toValidUTF8(toString(Params)), '\n', ' '), '"', '\''), '\\', '/'), 
+    toInt32(IPNetworkID) = -2147483648 ? -2147483647 : toInt32(IPNetworkID), 
+    toInt8(TraficSourceID) = -128 ? -127 : toInt8(TraficSourceID), 
+    toInt16(SearchEngineID) = -32768 ? -32767 : toInt16(SearchEngineID), 
+    replaceAll(replaceAll(replaceAll(toValidUTF8(toString(SearchPhrase)), '\n', ' '), '"', '\''), '\\', '/'), 
+    toInt8(AdvEngineID) = -128 ? -127 : toInt8(AdvEngineID), 
+    toInt8(IsArtifical) = -128 ? -127 : toInt8(IsArtifical), 
+    toInt16(WindowClientWidth) = -32768 ? -32767 : toInt16(WindowClientWidth), 
+    toInt16(WindowClientHeight) = -32768 ? -32767 : toInt16(WindowClientHeight), 
+    toInt16(ClientTimeZone) = -32768 ? -32767 : toInt16(ClientTimeZone), 
+    ClientEventTime, 
+    toInt8(SilverlightVersion1) = -128 ? -127 : toInt8(SilverlightVersion1), 
+    toInt8(SilverlightVersion2) = -128 ? -127 : toInt8(SilverlightVersion2), 
+    toInt32(SilverlightVersion3) = -2147483648 ? -2147483647 : toInt32(SilverlightVersion3), 
+    toInt16(SilverlightVersion4) = -32768 ? -32767 : toInt16(SilverlightVersion4), 
+    replaceAll(replaceAll(replaceAll(toValidUTF8(toString(PageCharset)), '\n', ' '), '"', '\''), '\\', '/'), 
+    toInt32(CodeVersion) = -2147483648 ? -2147483647 : toInt32(CodeVersion), 
+    toInt8(IsLink) = -128 ? -127 : toInt8(IsLink), 
+    toInt8(IsDownload) = -128 ? -127 : toInt8(IsDownload), 
+    toInt8(IsNotBounce) = -128 ? -127 : toInt8(IsNotBounce), 
+    toInt64(FUniqID) = -9223372036854775808 ? -9223372036854775807 : toInt64(FUniqID), 
+    replaceAll(replaceAll(replaceAll(toValidUTF8(toString(OriginalURL)), '\n', ' '), '"', '\''), '\\', '/'), 
+    toInt32(HID) = -2147483648 ? -2147483647 : toInt32(HID), 
+    toInt8(IsOldCounter) = -128 ? -127 : toInt8(IsOldCounter), 
+    toInt8(IsEvent) = -128 ? -127 : toInt8(IsEvent), 
+    toInt8(IsParameter) = -128 ? -127 : toInt8(IsParameter), 
+    toInt8(DontCountHits) = -128 ? -127 : toInt8(DontCountHits), 
+    toInt8(WithHash) = -128 ? -127 : toInt8(WithHash), 
+    replaceAll(replaceAll(replaceAll(toValidUTF8(toString(HitColor)), '\n', ' '), '"', '\''), '\\', '/'), 
+    LocalEventTime, 
+    toInt8(Age) = -128 ? -127 : toInt8(Age), 
+    toInt8(Sex) = -128 ? -127 : toInt8(Sex), 
+    toInt8(Income) = -128 ? -127 : toInt8(Income), 
+    toInt16(Interests) = -32768 ? -32767 : toInt16(Interests), 
+    toInt8(Robotness) = -128 ? -127 : toInt8(Robotness), 
+    toInt32(RemoteIP) = -2147483648 ? -2147483647 : toInt32(RemoteIP), 
+    toInt32(WindowName) = -2147483648 ? -2147483647 : toInt32(WindowName), 
+    toInt32(OpenerName) = -2147483648 ? -2147483647 : toInt32(OpenerName), 
+    toInt16(HistoryLength) = -32768 ? -32767 : toInt16(HistoryLength), 
+    replaceAll(replaceAll(replaceAll(toValidUTF8(toString(BrowserLanguage)), '\n', ' '), '"', '\''), '\\', '/'), 
+    replaceAll(replaceAll(replaceAll(toValidUTF8(toString(BrowserCountry)), '\n', ' '), '"', '\''), '\\', '/'), 
+    replaceAll(replaceAll(replaceAll(toValidUTF8(toString(SocialNetwork)), '\n', ' '), '"', '\''), '\\', '/'), 
+    replaceAll(replaceAll(replaceAll(toValidUTF8(toString(SocialAction)), '\n', ' '), '"', '\''), '\\', '/'), 
+    toInt16(HTTPError) = -32768 ? -32767 : toInt16(HTTPError), 
+    toInt32(SendTiming) = -2147483648 ? -2147483647 : toInt32(SendTiming), 
+    toInt32(DNSTiming) = -2147483648 ? -2147483647 : toInt32(DNSTiming), 
+    toInt32(ConnectTiming) = -2147483648 ? -2147483647 : toInt32(ConnectTiming), 
+    toInt32(ResponseStartTiming) = -2147483648 ? -2147483647 : toInt32(ResponseStartTiming), 
+    toInt32(ResponseEndTiming) = -2147483648 ? -2147483647 : toInt32(ResponseEndTiming), 
+    toInt32(FetchTiming) = -2147483648 ? -2147483647 : toInt32(FetchTiming), 
+    toInt8(SocialSourceNetworkID) = -128 ? -127 : toInt8(SocialSourceNetworkID), 
+    replaceAll(replaceAll(replaceAll(toValidUTF8(toString(SocialSourcePage)), '\n', ' '), '"', '\''), '\\', '/'), 
+    toInt64(ParamPrice) = -9223372036854775808 ? -9223372036854775807 : toInt64(ParamPrice), 
+    replaceAll(replaceAll(replaceAll(toValidUTF8(toString(ParamOrderID)), '\n', ' '), '"', '\''), '\\', '/'), 
+    replaceAll(replaceAll(replaceAll(toValidUTF8(toString(ParamCurrency)), '\n', ' '), '"', '\''), '\\', '/'), 
+    toInt16(ParamCurrencyID) = -32768 ? -32767 : toInt16(ParamCurrencyID), 
+    replaceAll(replaceAll(replaceAll(toValidUTF8(toString(OpenstatServiceName)), '\n', ' '), '"', '\''), '\\', '/'), 
+    replaceAll(replaceAll(replaceAll(toValidUTF8(toString(OpenstatCampaignID)), '\n', ' '), '"', '\''), '\\', '/'), 
+    replaceAll(replaceAll(replaceAll(toValidUTF8(toString(OpenstatAdID)), '\n', ' '), '"', '\''), '\\', '/'), 
+    replaceAll(replaceAll(replaceAll(toValidUTF8(toString(OpenstatSourceID)), '\n', ' '), '"', '\''), '\\', '/'), 
+    replaceAll(replaceAll(replaceAll(toValidUTF8(toString(UTMSource)), '\n', ' '), '"', '\''), '\\', '/'), 
+    replaceAll(replaceAll(replaceAll(toValidUTF8(toString(UTMMedium)), '\n', ' '), '"', '\''), '\\', '/'), 
+    replaceAll(replaceAll(replaceAll(toValidUTF8(toString(UTMCampaign)), '\n', ' '), '"', '\''), '\\', '/'), 
+    replaceAll(replaceAll(replaceAll(toValidUTF8(toString(UTMContent)), '\n', ' '), '"', '\''), '\\', '/'), 
+    replaceAll(replaceAll(replaceAll(toValidUTF8(toString(UTMTerm)), '\n', ' '), '"', '\''), '\\', '/'), 
+    replaceAll(replaceAll(replaceAll(toValidUTF8(toString(FromTag)), '\n', ' '), '"', '\''), '\\', '/'), 
+    toInt8(HasGCLID) = -128 ? -127 : toInt8(HasGCLID), 
+    toInt64(RefererHash) = -9223372036854775808 ? -9223372036854775807 : toInt64(RefererHash), 
+    toInt64(URLHash) = -9223372036854775808 ? -9223372036854775807 : toInt64(URLHash), 
+    toInt32(CLID) = -2147483648 ? -2147483647 : toInt32(CLID)
+FROM hits_100m_obfuscated
+INTO OUTFILE '/home/milovidov/example_datasets/hits_100m_obfuscated_monetdb.csv'
+FORMAT CSV;
+```
+
+Another try:
+```
+COPY INTO hits FROM '/home/milovidov/example_datasets/hits_100m_obfuscated_monetdb.csv' USING DELIMITERS ',', '\n', '"';
+```
+
+MonetDB still takes about one CPU core to load the data, while docs promised me parallel load.
+And there are strange pauses...
+
+```
+sql>COPY INTO hits FROM '/home/milovidov/example_datasets/hits_100m_obfuscated_monetdb.csv' USING DELIMITERS ',', '\n', '"';
+Failed to import table 'hits', 
+clk: 2:14 min
+```
+
+It still does not work!!!
+
+Let's look at the logs.
+Logs are found in 
+
+```
+/var/log/monetdb$ sudo less merovingian.log
+```
+
+And the log is the following:
+```
+2020-08-12 03:44:03 ERR test[542123]: #wrkr0-hits: GDKextendf: !ERROR: could not extend file: No space left on device
+2020-08-12 03:44:03 ERR test[542123]: #wrkr0-hits: MT_mremap: !ERROR: MT_mremap(/var/monetdb5/dbfarm/test/bat/10/1013.theap,0x7f0b2c3b0000,344981504,349175808): GDKextendf() failed
+2020-08-12 03:44:03 ERR test[542123]: #wrkr0-hits: GDKmremap: !ERROR: requesting virtual memory failed; memory requested: 349175808, memory in use: 113744056, virtual memory in use: 3124271288
+2020-08-12 03:44:03 ERR test[542123]: #wrkr0-hits: HEAPextend: !ERROR: failed to extend to 349175808 for 10/1013.theap: GDKmremap() failed
+2020-08-12 03:44:04 ERR test[542123]: #client14: createExceptionInternal: !ERROR: SQLException:importTable:42000!Failed to import table 'hits',
+```
+
+So, why it was created my "db farm" inside /var/monetdb5/ instead of /opt/ as I requested?
+
+Let's stop MonetDB and symlink /var/monetdb5 to /opt
+
+```
+COPY INTO hits FROM '/home/milovidov/example_datasets/hits_100m_obfuscated_monetdb.csv' USING DELIMITERS ',', E'\n', '"';
+```
+
+It started to load data... but after ten minutes it looks like stopped processing it, but the query does not finish.
+
+There is no `SHOW PROCESSLIST` command.
+
+I see the following message in `merovingian.log`:
+```
+2020-08-12 04:03:53 ERR test[682554]: #prod-hits: createExceptionInternal: !ERROR: MALException:sql.copy_from:line 40694471: record too long (EOS found)
+```
+
+What does EOS mean? It should not be "end of stream" because we have 100 000 000 records, that's more than just 40 694 471.
+
+Another try with TSV:
+
+```
+COPY INTO hits FROM '/home/milovidov/example_datasets/hits_100m_obfuscated_monetdb.tsv' USING DELIMITERS '\t';
+```
+
+Ok, it's doing something at least for ten minues...
+Ok, it's doing something at least for twenty minues...
+
+```
+100000000 affected rows
+clk: 28:02 min
+```
+
+Finally it has loaded data successfuly in 28 minutes. It's not fast - just below 60 000 rows per second.
+
+But the second query from the test does not work:
+
+```
+sql>SELECT count(*) FROM hits WHERE AdvEngineID <> 0;
+SELECT: identifier 'advengineid' unknown
+clk: 0.328 ms
+sql>DESC TABLE hits
+more>;
+syntax error, unexpected DESC in: "desc"
+clk: 0.471 ms
+sql>DESCRIBE TABLE hits;
+syntax error, unexpected IDENT in: "describe"
+clk: 0.245 ms
+sql>SHOW CREATE TABLE hits;
+syntax error, unexpected IDENT in: "show"
+clk: 0.246 ms
+sql>\d hits;
+table sys.hits; does not exist
+sql>\d test.hits;
+table test.hits; does not exist
+sql>\d
+TABLE  sys.hits
+sql>\t
+Current time formatter: clock
+sql>\dd
+unknown sub-command for \d: d
+sql>help
+more>;
+syntax error, unexpected IDENT in: "help"
+clk: 0.494 ms
+sql>SELECT count(*) FROM hits;
++-----------+
+| %1        |
++===========+
+| 100000001 |
++-----------+
+1 tuple
+clk: 1.949 ms
+sql>SELECT * FROM hits LIMIT 1;
+```
+
+And the query `SELECT * FROM hits LIMIT 1` does not finish in reasonable time.
+It took 3:23 min.
+
+Ok, I has to put all identifiers in quotes in my queries, like this:
+
+```
+SELECT count(*) FROM hits WHERE "AdvEngineID" <> 0;
+```
+
+There is no approximate count distinct functions. Will use exact count distinct instead.
+
+Run queries:
+`./benchmark.sh`
+
+It works rather slowly. It is barely using more than a single CPU core. And there is nothing about performance tuning in:
+https://www.monetdb.org/Documentation/ServerAdministration/ServerSetupAndConfiguration
+