diff --git a/programs/client/Suggest.cpp b/programs/client/Suggest.cpp
index ac18a131c3a..e85e7a21261 100644
--- a/programs/client/Suggest.cpp
+++ b/programs/client/Suggest.cpp
@@ -80,7 +80,7 @@ Suggest::Suggest()
              "WITH",         "TOTALS",   "HAVING", "ORDER",     "COLLATE",  "LIMIT",       "UNION",    "AND",         "OR",      "ASC",
              "IN",           "KILL",     "QUERY",  "SYNC",      "ASYNC",    "TEST",        "BETWEEN",  "TRUNCATE",    "USER",    "ROLE",
              "PROFILE",      "QUOTA",    "POLICY", "ROW",       "GRANT",    "REVOKE",      "OPTION",   "ADMIN",       "EXCEPT",  "REPLACE",
-             "IDENTIFIED",   "HOST",     "NAME",   "READONLY",  "WRITABLE", "PERMISSIVE",  "FOR",      "RESTRICTIVE", "FOR",     "RANDOMIZED",
+             "IDENTIFIED",   "HOST",     "NAME",   "READONLY",  "WRITABLE", "PERMISSIVE",  "FOR",      "RESTRICTIVE", "RANDOMIZED",
              "INTERVAL",     "LIMITS",   "ONLY",   "TRACKING",  "IP",       "REGEXP",      "ILIKE"};
 }
 
diff --git a/programs/format/CMakeLists.txt b/programs/format/CMakeLists.txt
index ab06708cd3a..49f17ef163f 100644
--- a/programs/format/CMakeLists.txt
+++ b/programs/format/CMakeLists.txt
@@ -5,6 +5,9 @@ set (CLICKHOUSE_FORMAT_LINK
         boost::program_options
         clickhouse_common_io
         clickhouse_parsers
+        clickhouse_functions
+        clickhouse_aggregate_functions
+        clickhouse_table_functions
         dbms
 )
 
diff --git a/programs/format/Format.cpp b/programs/format/Format.cpp
index daf2d671568..01f952bf95e 100644
--- a/programs/format/Format.cpp
+++ b/programs/format/Format.cpp
@@ -1,13 +1,29 @@
 #include <iostream>
+#include <string_view>
+#include <functional>
 #include <boost/program_options.hpp>
 
 #include <IO/ReadBufferFromFileDescriptor.h>
 #include <IO/ReadHelpers.h>
+#include <IO/WriteBufferFromFileDescriptor.h>
 #include <Parsers/ParserQuery.h>
 #include <Parsers/parseQuery.h>
 #include <Parsers/formatAST.h>
+#include <Parsers/obfuscateQueries.h>
 #include <Common/TerminalSize.h>
 
+#include <Interpreters/Context.h>
+#include <Functions/FunctionFactory.h>
+#include <Functions/registerFunctions.h>
+#include <AggregateFunctions/AggregateFunctionFactory.h>
+#include <AggregateFunctions/registerAggregateFunctions.h>
+#include <TableFunctions/TableFunctionFactory.h>
+#include <TableFunctions/registerTableFunctions.h>
+#include <Storages/StorageFactory.h>
+#include <Storages/registerStorages.h>
+#include <DataTypes/DataTypeFactory.h>
+
+
 #pragma GCC diagnostic ignored "-Wunused-function"
 #pragma GCC diagnostic ignored "-Wmissing-declarations"
 
@@ -22,6 +38,8 @@ int mainEntryClickHouseFormat(int argc, char ** argv)
         ("oneline", "format in single line")
         ("quiet,q", "just check syntax, no output on success")
         ("multiquery,n", "allow multiple queries in the same file")
+        ("obfuscate", "obfuscate instead of formatting")
+        ("seed", po::value<std::string>(), "seed (arbitrary string) that determines the result of obfuscation")
     ;
 
     boost::program_options::variables_map options;
@@ -40,10 +58,17 @@ int mainEntryClickHouseFormat(int argc, char ** argv)
         bool oneline = options.count("oneline");
         bool quiet = options.count("quiet");
         bool multiple = options.count("multiquery");
+        bool obfuscate = options.count("obfuscate");
 
-        if (quiet && (hilite || oneline))
+        if (quiet && (hilite || oneline || obfuscate))
         {
-            std::cerr << "Options 'hilite' or 'oneline' have no sense in 'quiet' mode." << std::endl;
+            std::cerr << "Options 'hilite' or 'oneline' or 'obfuscate' have no sense in 'quiet' mode." << std::endl;
+            return 2;
+        }
+
+        if (obfuscate && (hilite || oneline || quiet))
+        {
+            std::cerr << "Options 'hilite' or 'oneline' or 'quiet' have no sense in 'obfuscate' mode." << std::endl;
             return 2;
         }
 
@@ -51,21 +76,66 @@ int mainEntryClickHouseFormat(int argc, char ** argv)
         ReadBufferFromFileDescriptor in(STDIN_FILENO);
         readStringUntilEOF(query, in);
 
-        const char * pos = query.data();
-        const char * end = pos + query.size();
-
-        ParserQuery parser(end);
-        do
+        if (obfuscate)
         {
-            ASTPtr res = parseQueryAndMovePosition(parser, pos, end, "query", multiple, 0, DBMS_DEFAULT_MAX_PARSER_DEPTH);
-            if (!quiet)
+            WordMap obfuscated_words_map;
+            WordSet used_nouns;
+            SipHash hash_func;
+
+            if (options.count("seed"))
             {
-                formatAST(*res, std::cout, hilite, oneline);
-                if (multiple)
-                    std::cout << "\n;\n";
-                std::cout << std::endl;
+                std::string seed;
+                hash_func.update(options["seed"].as<std::string>());
             }
-        } while (multiple && pos != end);
+
+            SharedContextHolder shared_context = Context::createShared();
+            Context context = Context::createGlobal(shared_context.get());
+            context.makeGlobalContext();
+
+            registerFunctions();
+            registerAggregateFunctions();
+            registerTableFunctions();
+            registerStorages();
+
+            std::unordered_set<std::string> additional_names;
+
+            auto all_known_storage_names = StorageFactory::instance().getAllRegisteredNames();
+            auto all_known_data_type_names = DataTypeFactory::instance().getAllRegisteredNames();
+
+            additional_names.insert(all_known_storage_names.begin(), all_known_storage_names.end());
+            additional_names.insert(all_known_data_type_names.begin(), all_known_data_type_names.end());
+
+            KnownIdentifierFunc is_known_identifier = [&](std::string_view name)
+            {
+                std::string what(name);
+
+                return FunctionFactory::instance().tryGet(what, context) != nullptr
+                    || AggregateFunctionFactory::instance().isAggregateFunctionName(what)
+                    || TableFunctionFactory::instance().isTableFunctionName(what)
+                    || additional_names.count(what);
+            };
+
+            WriteBufferFromFileDescriptor out(STDOUT_FILENO);
+            obfuscateQueries(query, out, obfuscated_words_map, used_nouns, hash_func, is_known_identifier);
+        }
+        else
+        {
+            const char * pos = query.data();
+            const char * end = pos + query.size();
+
+            ParserQuery parser(end);
+            do
+            {
+                ASTPtr res = parseQueryAndMovePosition(parser, pos, end, "query", multiple, 0, DBMS_DEFAULT_MAX_PARSER_DEPTH);
+                if (!quiet)
+                {
+                    formatAST(*res, std::cout, hilite, oneline);
+                    if (multiple)
+                        std::cout << "\n;\n";
+                    std::cout << std::endl;
+                }
+            } while (multiple && pos != end);
+        }
     }
     catch (...)
     {
diff --git a/src/Common/BitHelpers.h b/src/Common/BitHelpers.h
index 699e379b8d3..e79daeba14e 100644
--- a/src/Common/BitHelpers.h
+++ b/src/Common/BitHelpers.h
@@ -1,22 +1,12 @@
 #pragma once
 
 #include <cstddef>
+#include <cstdint>
 #include <cassert>
 #include <type_traits>
 #include <common/defines.h>
 
 
-/** Returns log2 of number, rounded down.
-  * Compiles to single 'bsr' instruction on x86.
-  * For zero argument, result is unspecified.
-  */
-inline unsigned int bitScanReverse(unsigned int x)
-{
-    assert(x != 0);
-    return sizeof(unsigned int) * 8 - 1 - __builtin_clz(x);
-}
-
-
 /** For zero argument, result is zero.
   * For arguments with most significand bit set, result is n.
   * For other arguments, returns value, rounded up to power of two.
@@ -41,10 +31,9 @@ inline size_t roundUpToPowerOfTwoOrZero(size_t n)
 
 
 template <typename T>
-inline size_t getLeadingZeroBits(T x)
+inline size_t getLeadingZeroBitsUnsafe(T x)
 {
-    if (!x)
-        return sizeof(x) * 8;
+    assert(x != 0);
 
     if constexpr (sizeof(T) <= sizeof(unsigned int))
     {
@@ -60,10 +49,32 @@ inline size_t getLeadingZeroBits(T x)
     }
 }
 
+
+template <typename T>
+inline size_t getLeadingZeroBits(T x)
+{
+    if (!x)
+        return sizeof(x) * 8;
+
+    return getLeadingZeroBitsUnsafe(x);
+}
+
+/** Returns log2 of number, rounded down.
+  * Compiles to single 'bsr' instruction on x86.
+  * For zero argument, result is unspecified.
+  */
+template <typename T>
+inline uint32_t bitScanReverse(T x)
+{
+    return (std::max<size_t>(sizeof(T), sizeof(unsigned int))) * 8 - 1 - getLeadingZeroBitsUnsafe(x);
+}
+
 // Unsafe since __builtin_ctz()-family explicitly state that result is undefined on x == 0
 template <typename T>
 inline size_t getTrailingZeroBitsUnsafe(T x)
 {
+    assert(x != 0);
+
     if constexpr (sizeof(T) <= sizeof(unsigned int))
     {
         return __builtin_ctz(x);
@@ -88,8 +99,8 @@ inline size_t getTrailingZeroBits(T x)
 }
 
 /** Returns a mask that has '1' for `bits` LSB set:
- * maskLowBits<UInt8>(3) => 00000111
- */
+  * maskLowBits<UInt8>(3) => 00000111
+  */
 template <typename T>
 inline T maskLowBits(unsigned char bits)
 {
diff --git a/src/Common/StringUtils/StringUtils.h b/src/Common/StringUtils/StringUtils.h
index a1e8fb79435..904e3035dd8 100644
--- a/src/Common/StringUtils/StringUtils.h
+++ b/src/Common/StringUtils/StringUtils.h
@@ -67,10 +67,19 @@ inline bool isASCII(char c)
     return static_cast<unsigned char>(c) < 0x80;
 }
 
+inline bool isLowerAlphaASCII(char c)
+{
+    return (c >= 'a' && c <= 'z');
+}
+
+inline bool isUpperAlphaASCII(char c)
+{
+    return (c >= 'A' && c <= 'Z');
+}
+
 inline bool isAlphaASCII(char c)
 {
-    return (c >= 'a' && c <= 'z')
-        || (c >= 'A' && c <= 'Z');
+    return isLowerAlphaASCII(c) || isUpperAlphaASCII(c);
 }
 
 inline bool isNumericASCII(char c)
@@ -122,6 +131,16 @@ inline bool isPrintableASCII(char c)
     return uc >= 32 && uc <= 126;   /// 127 is ASCII DEL.
 }
 
+inline bool isPunctuationASCII(char c)
+{
+    uint8_t uc = c;
+    return (uc >= 33 && uc <= 47)
+        || (uc >= 58 && uc <= 64)
+        || (uc >= 91 && uc <= 96)
+        || (uc >= 123 && uc <= 125);
+}
+
+
 inline bool isValidIdentifier(const std::string_view & str)
 {
     return !str.empty() && isValidIdentifierBegin(str[0]) && std::all_of(str.begin() + 1, str.end(), isWordCharASCII);
diff --git a/src/Parsers/obfuscateQueries.cpp b/src/Parsers/obfuscateQueries.cpp
new file mode 100644
index 00000000000..32382b70bd7
--- /dev/null
+++ b/src/Parsers/obfuscateQueries.cpp
@@ -0,0 +1,937 @@
+#include <cassert>
+
+#include <Parsers/obfuscateQueries.h>
+#include <Parsers/Lexer.h>
+#include <Poco/String.h>
+#include <Common/Exception.h>
+#include <Common/StringUtils/StringUtils.h>
+#include <Common/BitHelpers.h>
+#include <IO/WriteHelpers.h>
+#include <IO/WriteBuffer.h>
+#include <IO/ReadHelpers.h>
+#include <IO/ReadBufferFromMemory.h>
+
+
+namespace DB
+{
+
+namespace ErrorCodes
+{
+    extern const int TOO_MANY_TEMPORARY_COLUMNS;
+}
+
+
+namespace
+{
+
+const std::unordered_set<std::string_view> keywords
+{
+    "CREATE",       "DATABASE", "IF",     "NOT",       "EXISTS",   "TEMPORARY",   "TABLE",    "ON",          "CLUSTER", "DEFAULT",
+    "MATERIALIZED", "ALIAS",    "ENGINE", "AS",        "VIEW",     "POPULATE",    "SETTINGS", "ATTACH",      "DETACH",  "DROP",
+    "RENAME",       "TO",       "ALTER",  "ADD",       "MODIFY",   "CLEAR",       "COLUMN",   "AFTER",       "COPY",    "PROJECT",
+    "PRIMARY",      "KEY",      "CHECK",  "PARTITION", "PART",     "FREEZE",      "FETCH",    "FROM",        "SHOW",    "INTO",
+    "OUTFILE",      "FORMAT",   "TABLES", "DATABASES", "LIKE",     "PROCESSLIST", "CASE",     "WHEN",        "THEN",    "ELSE",
+    "END",          "DESCRIBE", "DESC",   "USE",       "SET",      "OPTIMIZE",    "FINAL",    "DEDUPLICATE", "INSERT",  "VALUES",
+    "SELECT",       "DISTINCT", "SAMPLE", "ARRAY",     "JOIN",     "GLOBAL",      "LOCAL",    "ANY",         "ALL",     "INNER",
+    "LEFT",         "RIGHT",    "FULL",   "OUTER",     "CROSS",    "USING",       "PREWHERE", "WHERE",       "GROUP",   "BY",
+    "WITH",         "TOTALS",   "HAVING", "ORDER",     "COLLATE",  "LIMIT",       "UNION",    "AND",         "OR",      "ASC",
+    "IN",           "KILL",     "QUERY",  "SYNC",      "ASYNC",    "TEST",        "BETWEEN",  "TRUNCATE",    "USER",    "ROLE",
+    "PROFILE",      "QUOTA",    "POLICY", "ROW",       "GRANT",    "REVOKE",      "OPTION",   "ADMIN",       "EXCEPT",  "REPLACE",
+    "IDENTIFIED",   "HOST",     "NAME",   "READONLY",  "WRITABLE", "PERMISSIVE",  "FOR",      "RESTRICTIVE", "RANDOMIZED",
+    "INTERVAL",     "LIMITS",   "ONLY",   "TRACKING",  "IP",       "REGEXP",      "ILIKE",    "DICTIONARY"
+};
+
+const std::unordered_set<std::string_view> keep_words
+{
+    "id", "name", "value", "num",
+    "Id", "Name", "Value", "Num",
+    "ID", "NAME", "VALUE", "NUM",
+};
+
+/// The list of nouns collected from here: http://www.desiquintans.com/nounlist, Public domain.
+std::initializer_list<std::string_view> nouns
+{
+"aardvark", "abacus", "abbey", "abbreviation", "abdomen", "ability", "abnormality", "abolishment", "abortion",
+"abrogation", "absence", "abundance", "abuse", "academics", "academy", "accelerant", "accelerator", "accent", "acceptance", "access",
+"accessory", "accident", "accommodation", "accompanist", "accomplishment", "accord", "accordance", "accordion", "account", "accountability",
+"accountant", "accounting", "accuracy", "accusation", "acetate", "achievement", "achiever", "acid", "acknowledgment", "acorn", "acoustics",
+"acquaintance", "acquisition", "acre", "acrylic", "act", "action", "activation", "activist", "activity", "actor", "actress", "acupuncture",
+"ad", "adaptation", "adapter", "addiction", "addition", "address", "adjective", "adjustment", "admin", "administration", "administrator",
+"admire", "admission", "adobe", "adoption", "adrenalin", "adrenaline", "adult", "adulthood", "advance", "advancement", "advantage", "advent",
+"adverb", "advertisement", "advertising", "advice", "adviser", "advocacy", "advocate", "affair", "affect", "affidavit", "affiliate",
+"affinity", "afoul", "afterlife", "aftermath", "afternoon", "aftershave", "aftershock", "afterthought", "age", "agency", "agenda", "agent",
+"aggradation", "aggression", "aglet", "agony", "agreement", "agriculture", "aid", "aide", "aim", "air", "airbag", "airbus", "aircraft",
+"airfare", "airfield", "airforce", "airline", "airmail", "airman", "airplane", "airport", "airship", "airspace", "alarm", "alb", "albatross",
+"album", "alcohol", "alcove", "alder", "ale", "alert", "alfalfa", "algebra", "algorithm", "alias", "alibi", "alien", "allegation", "allergist",
+"alley", "alliance", "alligator", "allocation", "allowance", "alloy", "alluvium", "almanac", "almighty", "almond", "alpaca", "alpenglow",
+"alpenhorn", "alpha", "alphabet", "altar", "alteration", "alternative", "altitude", "alto", "aluminium", "aluminum", "amazement", "amazon",
+"ambassador", "amber", "ambience", "ambiguity", "ambition", "ambulance", "amendment", "amenity", "ammunition", "amnesty", "amount", "amusement",
+"anagram", "analgesia", "analog", "analogue", "analogy", "analysis", "analyst", "analytics", "anarchist", "anarchy", "anatomy", "ancestor",
+"anchovy", "android", "anesthesiologist", "anesthesiology", "angel", "anger", "angina", "angiosperm", "angle", "angora", "angstrom",
+"anguish", "animal", "anime", "anise", "ankle", "anklet", "anniversary", "announcement", "annual", "anorak", "answer", "ant", "anteater",
+"antecedent", "antechamber", "antelope", "antennae", "anterior", "anthropology", "antibody", "anticipation", "anticodon", "antigen",
+"antique", "antiquity", "antler", "antling", "anxiety", "anybody", "anyone", "anything", "anywhere", "apartment", "ape", "aperitif",
+"apology", "app", "apparatus", "apparel", "appeal", "appearance", "appellation", "appendix", "appetiser", "appetite", "appetizer", "applause",
+"apple", "applewood", "appliance", "application", "appointment", "appreciation", "apprehension", "approach", "appropriation", "approval",
+"apricot", "apron", "apse", "aquarium", "aquifer", "arcade", "arch", "archaeologist", "archaeology", "archeology", "archer",
+"architect", "architecture", "archives", "area", "arena", "argument", "arithmetic", "ark", "arm", "armadillo", "armament",
+"armchair", "armoire", "armor", "armour", "armpit", "armrest", "army", "arrangement", "array", "arrest", "arrival", "arrogance", "arrow",
+"art", "artery", "arthur", "artichoke", "article", "artifact", "artificer", "artist", "ascend", "ascent", "ascot", "ash", "ashram", "ashtray",
+"aside", "asparagus", "aspect", "asphalt", "aspic", "assassination", "assault", "assembly", "assertion", "assessment", "asset",
+"assignment", "assist", "assistance", "assistant", "associate", "association", "assumption", "assurance", "asterisk", "astrakhan", "astrolabe",
+"astrologer", "astrology", "astronomy", "asymmetry", "atelier", "atheist", "athlete", "athletics", "atmosphere", "atom", "atrium", "attachment",
+"attack", "attacker", "attainment", "attempt", "attendance", "attendant", "attention", "attenuation", "attic", "attitude", "attorney",
+"attraction", "attribute", "auction", "audience", "audit", "auditorium", "aunt", "authentication", "authenticity", "author", "authorisation",
+"authority", "authorization", "auto", "autoimmunity", "automation", "automaton", "autumn", "availability", "avalanche", "avenue", "average",
+"avocado", "award", "awareness", "awe", "axis", "azimuth", "babe", "baboon", "babushka", "baby", "bachelor", "back", "backbone",
+"backburn", "backdrop", "background", "backpack", "backup", "backyard", "bacon", "bacterium", "badge", "badger", "bafflement", "bag",
+"bagel", "baggage", "baggie", "baggy", "bagpipe", "bail", "bait", "bake", "baker", "bakery", "bakeware", "balaclava", "balalaika", "balance",
+"balcony", "ball", "ballet", "balloon", "balloonist", "ballot", "ballpark", "bamboo", "ban", "banana", "band", "bandana", "bandanna",
+"bandolier", "bandwidth", "bangle", "banjo", "bank", "bankbook", "banker", "banking", "bankruptcy", "banner", "banquette", "banyan",
+"baobab", "bar", "barbecue", "barbeque", "barber", "barbiturate", "bargain", "barge", "baritone", "barium", "bark", "barley", "barn",
+"barometer", "barracks", "barrage", "barrel", "barrier", "barstool", "bartender", "base", "baseball", "baseboard", "baseline", "basement",
+"basics", "basil", "basin", "basis", "basket", "basketball", "bass", "bassinet", "bassoon", "bat", "bath", "bather", "bathhouse", "bathrobe",
+"bathroom", "bathtub", "battalion", "batter", "battery", "batting", "battle", "battleship", "bay", "bayou", "beach", "bead", "beak",
+"beam", "bean", "beancurd", "beanie", "beanstalk", "bear", "beard", "beast", "beastie", "beat", "beating", "beauty", "beaver", "beck",
+"bed", "bedrock", "bedroom", "bee", "beech", "beef", "beer", "beet", "beetle", "beggar", "beginner", "beginning", "begonia", "behalf",
+"behavior", "behaviour", "beheading", "behest", "behold", "being", "belfry", "belief", "believer", "bell", "belligerency", "bellows",
+"belly", "belt", "bench", "bend", "beneficiary", "benefit", "beret", "berry", "bestseller", "bet", "beverage", "beyond",
+"bias", "bibliography", "bicycle", "bid", "bidder", "bidding", "bidet", "bifocals", "bijou", "bike", "bikini", "bill", "billboard", "billing",
+"billion", "bin", "binoculars", "biology", "biopsy", "biosphere", "biplane", "birch", "bird", "birdbath", "birdcage",
+"birdhouse", "birth", "birthday", "biscuit", "bit", "bite", "bitten", "bitter", "black", "blackberry", "blackbird", "blackboard", "blackfish",
+"blackness", "bladder", "blade", "blame", "blank", "blanket", "blast", "blazer", "blend", "blessing", "blight", "blind", "blinker", "blister",
+"blizzard", "block", "blocker", "blog", "blogger", "blood", "bloodflow", "bloom", "bloomer", "blossom", "blouse", "blow", "blowgun",
+"blowhole", "blue", "blueberry", "blush", "boar", "board", "boat", "boatload", "boatyard", "bob", "bobcat", "body", "bog", "bolero",
+"bolt", "bomb", "bomber", "bombing", "bond", "bonding", "bondsman", "bone", "bonfire", "bongo", "bonnet", "bonsai", "bonus", "boogeyman",
+"book", "bookcase", "bookend", "booking", "booklet", "bookmark", "boolean", "boom", "boon", "boost", "booster", "boot", "bootee", "bootie",
+"booty", "border", "bore", "borrower", "borrowing", "bosom", "boss", "botany", "bother", "bottle", "bottling", "bottom",
+"boudoir", "bough", "boulder", "boulevard", "boundary", "bouquet", "bourgeoisie", "bout", "boutique", "bow", "bower", "bowl", "bowler",
+"bowling", "bowtie", "box", "boxer", "boxspring", "boy", "boycott", "boyfriend", "boyhood", "boysenberry", "bra", "brace", "bracelet",
+"bracket", "brain", "brake", "bran", "branch", "brand", "brandy", "brass", "brassiere", "bratwurst", "bread", "breadcrumb", "breadfruit",
+"break", "breakdown", "breakfast", "breakpoint", "breakthrough", "breast", "breastplate", "breath", "breeze", "brewer", "bribery", "brick",
+"bricklaying", "bride", "bridge", "brief", "briefing", "briefly", "briefs", "brilliant", "brink", "brisket", "broad", "broadcast", "broccoli",
+"brochure", "brocolli", "broiler", "broker", "bronchitis", "bronco", "bronze", "brooch", "brood", "brook", "broom", "brother",
+"brow", "brown", "brownie", "browser", "browsing", "brunch", "brush", "brushfire", "brushing", "bubble", "buck", "bucket", "buckle",
+"buckwheat", "bud", "buddy", "budget", "buffalo", "buffer", "buffet", "bug", "buggy", "bugle", "builder", "building", "bulb", "bulk",
+"bull", "bulldozer", "bullet", "bump", "bumper", "bun", "bunch", "bungalow", "bunghole", "bunkhouse", "burden", "bureau",
+"burglar", "burial", "burlesque", "burn", "burning", "burrito", "burro", "burrow", "burst", "bus", "bush", "business", "businessman",
+"bust", "bustle", "butane", "butcher", "butler", "butter", "butterfly", "button", "buy", "buyer", "buying", "buzz", "buzzard",
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+"woodshed", "woodwind", "wool", "woolens", "word", "wording", "work", "workbench", "worker", "workforce", "workhorse", "working", "workout",
+"workplace", "workshop", "world", "worm", "worry", "worship", "worshiper", "worth", "wound", "wrap", "wraparound", "wrapper", "wrapping",
+"wreck", "wrecker", "wren", "wrench", "wrestler", "wriggler", "wrinkle", "wrist", "writer", "writing", "wrong", "xylophone", "yacht",
+"yahoo", "yak", "yam", "yang", "yard", "yarmulke", "yarn", "yawl", "year", "yeast", "yellow", "yellowjacket", "yesterday", "yew", "yin",
+"yoga", "yogurt", "yoke", "yolk", "young", "youngster", "yourself", "youth", "yoyo", "yurt", "zampone", "zebra", "zebrafish", "zen",
+"zephyr", "zero", "ziggurat", "zinc", "zipper", "zither", "zombie", "zone", "zoo", "zoologist", "zoology", "zucchini"
+};
+
+
+std::string_view obfuscateWord(std::string_view src, WordMap & obfuscate_map, WordSet & used_nouns, SipHash hash_func)
+{
+    /// Prevent using too many nouns
+    if (obfuscate_map.size() * 2 > nouns.size())
+        throw Exception("Too many unique identifiers in queries", ErrorCodes::TOO_MANY_TEMPORARY_COLUMNS);
+
+    std::string_view & mapped = obfuscate_map[src];
+    if (!mapped.empty())
+        return mapped;
+
+    hash_func.update(src.data(), src.size());
+    std::string_view noun = nouns.begin()[hash_func.get64() % nouns.size()];
+
+    /// Prevent collisions
+    while (!used_nouns.insert(noun).second)
+    {
+        hash_func.update('\0');
+        noun = nouns.begin()[hash_func.get64() % nouns.size()];
+    }
+
+    mapped = noun;
+    return mapped;
+}
+
+
+void obfuscateIdentifier(std::string_view src, WriteBuffer & result, WordMap & obfuscate_map, WordSet & used_nouns, SipHash hash_func)
+{
+    /// Find words in form 'snake_case', 'CamelCase' or 'ALL_CAPS'.
+
+    const char * src_pos = src.data();
+    const char * src_end = src_pos + src.size();
+
+    const char * word_begin = src_pos;
+    bool word_has_alphanumerics = false;
+
+    auto append_word = [&]
+    {
+        std::string_view word(word_begin, src_pos - word_begin);
+
+        if (keep_words.count(word))
+        {
+            result.write(word.data(), word.size());
+        }
+        else
+        {
+            std::string_view obfuscated_word = obfuscateWord(word, obfuscate_map, used_nouns, hash_func);
+
+            /// Match the style of source word.
+            bool first_caps = !word.empty() && isUpperAlphaASCII(word[0]);
+            bool all_caps = first_caps && word.size() >= 2 && isUpperAlphaASCII(word[1]);
+
+            for (size_t i = 0, size = obfuscated_word.size(); i < size; ++i)
+            {
+                if (all_caps || (i == 0 && first_caps))
+                    result.write(toUpperIfAlphaASCII(obfuscated_word[i]));
+                else
+                    result.write(obfuscated_word[i]);
+            }
+        }
+
+        word_begin = src_pos;
+        word_has_alphanumerics = false;
+    };
+
+    while (src_pos < src_end)
+    {
+        if (isAlphaNumericASCII(src_pos[0]))
+            word_has_alphanumerics = true;
+
+        if (word_has_alphanumerics && src_pos[0] == '_')
+        {
+            append_word();
+            result.write('_');
+            ++word_begin;
+        }
+        else if (word_has_alphanumerics && isUpperAlphaASCII(src_pos[0]) && isLowerAlphaASCII(src_pos[-1])) /// xX
+        {
+            append_word();
+        }
+
+        ++src_pos;
+    }
+
+    if (word_begin < src_pos)
+        append_word();
+}
+
+
+void obfuscateLiteral(std::string_view src, WriteBuffer & result, SipHash hash_func)
+{
+    const char * src_pos = src.data();
+    const char * src_end = src_pos + src.size();
+
+    while (src_pos < src_end)
+    {
+        /// Date
+        if (src_pos + strlen("0000-00-00") <= src_end
+            && isNumericASCII(src_pos[0])
+            && isNumericASCII(src_pos[1])
+            && isNumericASCII(src_pos[2])
+            && isNumericASCII(src_pos[3])
+            && src_pos[4] == '-'
+            && isNumericASCII(src_pos[5])
+            && isNumericASCII(src_pos[6])
+            && src_pos[7] == '-'
+            && isNumericASCII(src_pos[8])
+            && isNumericASCII(src_pos[9]))
+        {
+            DayNum date;
+            ReadBufferFromMemory in(src_pos, strlen("0000-00-00"));
+            readDateText(date, in);
+
+            SipHash hash_func_date = hash_func;
+
+            if (date != 0)
+            {
+                date += hash_func_date.get64() % 256;
+            }
+
+            writeDateText(date, result);
+            src_pos += strlen("0000-00-00");
+
+            /// DateTime
+            if (src_pos + strlen(" 00:00:00") <= src_end
+                && isNumericASCII(src_pos[1])
+                && isNumericASCII(src_pos[2])
+                && src_pos[3] == ':'
+                && isNumericASCII(src_pos[4])
+                && isNumericASCII(src_pos[5])
+                && src_pos[6] == ':'
+                && isNumericASCII(src_pos[7])
+                && isNumericASCII(src_pos[8]))
+            {
+                result.write(src_pos[0]);
+
+                hash_func_date.update(src_pos + 1, strlen("00:00:00"));
+
+                uint64_t hash_value = hash_func_date.get64();
+                uint32_t new_hour = hash_value % 24;
+                hash_value /= 24;
+                uint32_t new_minute = hash_value % 60;
+                hash_value /= 60;
+                uint32_t new_second = hash_value % 60;
+
+                result.write('0' + (new_hour / 10));
+                result.write('0' + (new_hour % 10));
+                result.write(':');
+                result.write('0' + (new_minute / 10));
+                result.write('0' + (new_minute % 10));
+                result.write(':');
+                result.write('0' + (new_second / 10));
+                result.write('0' + (new_second % 10));
+
+                src_pos += strlen(" 00:00:00");
+            }
+        }
+        else if (isNumericASCII(src_pos[0]))
+        {
+            /// Number
+            if (src_pos[0] == '0' || src_pos[0] == '1')
+            {
+                /// Keep zero and one as is.
+                result.write(src_pos[0]);
+                ++src_pos;
+            }
+            else
+            {
+                ReadBufferFromMemory in(src_pos, src_end - src_pos);
+                uint64_t num;
+                readIntText(num, in);
+                SipHash hash_func_num = hash_func;
+                hash_func_num.update(src_pos, in.count());
+                src_pos += in.count();
+
+                /// Obfuscate number but keep it within same power of two range.
+
+                uint64_t obfuscated = hash_func_num.get64();
+                uint64_t log2 = bitScanReverse(num);
+
+                obfuscated = (1ULL << log2) + obfuscated % (1ULL << log2);
+                writeIntText(obfuscated, result);
+            }
+        }
+        else if (src_pos + 1 < src_end
+            && (src_pos[0] == 'e' || src_pos[0] == 'E')
+            && (isNumericASCII(src_pos[1]) || (src_pos[1] == '-' && src_pos + 2 < src_end && isNumericASCII(src_pos[2]))))
+        {
+            /// Something like an exponent of floating point number. Keep it as is.
+            /// But if it looks like a large number, overflow it into 16 bit.
+
+            result.write(src_pos[0]);
+            ++src_pos;
+
+            ReadBufferFromMemory in(src_pos, src_end - src_pos);
+            int16_t num;
+            readIntText(num, in);
+            writeIntText(num, result);
+            src_pos += in.count();
+        }
+        else if (isAlphaASCII(src_pos[0]))
+        {
+            /// Alphabetial characters
+
+            const char * alpha_end = src_pos + 1;
+            while (alpha_end < src_end && isAlphaASCII(*alpha_end))
+                ++alpha_end;
+
+            hash_func.update(src_pos, alpha_end - src_pos);
+            pcg64 rng(hash_func.get64());
+
+            while (src_pos < alpha_end)
+            {
+                auto random = rng();
+                if (isLowerAlphaASCII(*src_pos))
+                    result.write('a' + random % 26);
+                else
+                    result.write('A' + random % 26);
+
+                ++src_pos;
+            }
+        }
+        else if (isASCII(src_pos[0]))
+        {
+            /// Punctuation, whitespace and control characters - keep as is.
+
+            result.write(src_pos[0]);
+            ++src_pos;
+        }
+        else if (src_pos[0] <= '\xBF')
+        {
+            /// Continuation of UTF-8 sequence.
+            hash_func.update(src_pos[0]);
+            uint64_t hash = hash_func.get64();
+
+            char c = 0x80 + hash % (0xC0 - 0x80);
+            result.write(c);
+
+            ++src_pos;
+        }
+        else
+        {
+            /// Start of UTF-8 sequence.
+            hash_func.update(src_pos[0]);
+            uint64_t hash = hash_func.get64();
+
+            if (src_pos[0] < '\xE0')
+            {
+                char c = 0xC0 + hash % 32;
+                result.write(c);
+            }
+            else if (src_pos[0] < '\xF0')
+            {
+                char c = 0xE0 + hash % 16;
+                result.write(c);
+            }
+            else
+            {
+                char c = 0xF0 + hash % 8;
+                result.write(c);
+            }
+
+            ++src_pos;
+        }
+    }
+}
+
+}
+
+
+void obfuscateQueries(
+    std::string_view src,
+    WriteBuffer & result,
+    WordMap & obfuscate_map,
+    WordSet & used_nouns,
+    SipHash hash_func,
+    KnownIdentifierFunc known_identifier_func)
+{
+    Lexer lexer(src.data(), src.data() + src.size());
+    while (true)
+    {
+        Token token = lexer.nextToken();
+        std::string_view whole_token(token.begin, token.size());
+
+        if (token.isEnd())
+            break;
+
+        if (token.type == TokenType::BareWord)
+        {
+            std::string whole_token_uppercase(whole_token);
+            Poco::toUpperInPlace(whole_token_uppercase);
+
+            if (keywords.count(whole_token_uppercase)
+                || known_identifier_func(whole_token))
+            {
+                /// Keep keywords as is.
+                result.write(token.begin, token.size());
+            }
+            else
+            {
+                /// Obfuscate identifiers
+                obfuscateIdentifier(whole_token, result, obfuscate_map, used_nouns, hash_func);
+            }
+        }
+        else if (token.type == TokenType::QuotedIdentifier)
+        {
+            assert(token.size() >= 2);
+
+            /// Write quotes and the obfuscated content inside.
+            result.write(*token.begin);
+            obfuscateIdentifier({token.begin + 1, token.size() - 2}, result, obfuscate_map, used_nouns, hash_func);
+            result.write(token.end[-1]);
+        }
+        else if (token.type == TokenType::Number)
+        {
+            obfuscateLiteral(whole_token, result, hash_func);
+        }
+        else if (token.type == TokenType::StringLiteral)
+        {
+            assert(token.size() >= 2);
+
+            result.write(*token.begin);
+            obfuscateLiteral({token.begin + 1, token.size() - 2}, result, hash_func);
+            result.write(token.end[-1]);
+        }
+        else if (token.type == TokenType::Comment)
+        {
+            /// Skip comments - they may contain confidential info.
+        }
+        else
+        {
+            /// Everyting else is kept as is.
+            result.write(token.begin, token.size());
+        }
+    }
+}
+
+}
+
diff --git a/src/Parsers/obfuscateQueries.h b/src/Parsers/obfuscateQueries.h
new file mode 100644
index 00000000000..0a192649a92
--- /dev/null
+++ b/src/Parsers/obfuscateQueries.h
@@ -0,0 +1,50 @@
+#pragma once
+
+#include <string>
+#include <unordered_set>
+#include <unordered_map>
+#include <string_view>
+#include <functional>
+
+#include <Common/SipHash.h>
+
+
+namespace DB
+{
+
+class WriteBuffer;
+
+using WordMap = std::unordered_map<std::string_view, std::string_view>;
+using WordSet = std::unordered_set<std::string_view>;
+using KnownIdentifierFunc = std::function<bool(std::string_view)>;
+
+/** Takes one or multiple queries and obfuscates them by replacing identifiers to pseudorandom words
+  * and replacing literals to random values, while preserving the structure of the queries and the general sense.
+  *
+  * Its intended use case is when the user wants to share their queries for testing and debugging
+  * but is afraid to disclose the details about their column names, domain area and values of constants.
+  *
+  * It can obfuscate multiple queries in consistent fashion - identical names will be transformed to identical results.
+  *
+  * The function is not guaranteed to always give correct result or to be secure. It's implemented in "best effort" fashion.
+  *
+  * @param src - a string with source queries.
+  * @param result - where the obfuscated queries will be written.
+  * @param obfuscate_map - information about substituted identifiers
+  *  (pass empty map at the beginning or reuse it from previous invocation to get consistent result)
+  * @param used_nouns - information about words used for substitution
+  *  (pass empty set at the beginning or reuse it from previous invocation to get consistent result)
+  * @param hash_func - hash function that will be used as a pseudorandom source,
+  *  it's recommended to preseed the function before passing here.
+  * @param known_identifier_func - a function that returns true if identifier is known name
+  *  (of function, aggregate function, etc. that should be kept as is). If it returns false, identifier will be obfuscated.
+  */
+void obfuscateQueries(
+    std::string_view src,
+    WriteBuffer & result,
+    WordMap & obfuscate_map,
+    WordSet & used_nouns,
+    SipHash hash_func,
+    KnownIdentifierFunc known_identifier_func);
+
+}
diff --git a/src/Parsers/ya.make b/src/Parsers/ya.make
index 0a0c301b722..4ec97b8b55b 100644
--- a/src/Parsers/ya.make
+++ b/src/Parsers/ya.make
@@ -85,6 +85,7 @@ SRCS(
     MySQL/ASTDeclareReference.cpp
     MySQL/ASTDeclareSubPartition.cpp
     MySQL/ASTDeclareTableOptions.cpp
+    obfuscateQueries.cpp
     parseDatabaseAndTableName.cpp
     parseIdentifierOrStringLiteral.cpp
     parseIntervalKind.cpp
diff --git a/tests/queries/0_stateless/01508_query_obfuscator.reference b/tests/queries/0_stateless/01508_query_obfuscator.reference
new file mode 100644
index 00000000000..0064ac73a09
--- /dev/null
+++ b/tests/queries/0_stateless/01508_query_obfuscator.reference
@@ -0,0 +1,16 @@
+SELECT 116, 'Qqfu://2020-02-10isqkc1203 sp 2000-05-27T18:38:01', 13e100, Residue_id_breakfastDevice, park(Innervation), avgIf(remote('128.0.0.1'))
+SELECT shell_dust_tintype between crumb and shoat, case when peach >= 116 then bombing else null end
+
+SELECT
+    ChimeID,
+    Testimonial.ID, Testimonial.SipCauseway,
+    TankfulTRUMPET,
+    HUMIDITY.TermiteName, HUMIDITY.TermiteSculptural, HUMIDITY.TermiteGuilt, HUMIDITY.TermiteIntensity, HUMIDITY.SipCauseway, HUMIDITY.Coat
+FROM merge.tinkle_efficiency
+WHERE
+    FaithSeller >= '2020-10-13' AND FaithSeller <= '2020-10-21'
+    AND MandolinID = 30750384
+    AND intHash32(GafferID) = 448362928 AND intHash64(GafferID) = 12572659331310383983
+    AND ChimeID IN (8195672321757027078, 7079643623150622129, 5057006826979676478, 7886875230160484653, 7494974311229040743)
+    AND Stot = 1
+
diff --git a/tests/queries/0_stateless/01508_query_obfuscator.sh b/tests/queries/0_stateless/01508_query_obfuscator.sh
new file mode 100755
index 00000000000..d60e42489fa
--- /dev/null
+++ b/tests/queries/0_stateless/01508_query_obfuscator.sh
@@ -0,0 +1,22 @@
+#!/usr/bin/env bash
+
+CURDIR=$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)
+. "$CURDIR"/../shell_config.sh
+
+$CLICKHOUSE_FORMAT --seed Hello --obfuscate <<< "SELECT 123, 'Test://2020-01-01hello1234 at 2000-01-01T01:02:03', 12e100, Gibberish_id_testCool, hello(World), avgIf(remote('127.0.0.1'))"
+$CLICKHOUSE_FORMAT --seed Hello --obfuscate <<< "SELECT cost_first_screen between a and b, case when x >= 123 then y else null end"
+
+$CLICKHOUSE_FORMAT --seed Hello --obfuscate <<< "
+SELECT
+    VisitID,
+    Goals.ID, Goals.EventTime,
+    WatchIDs,
+    EAction.ProductName, EAction.ProductPrice, EAction.ProductCurrency, EAction.ProductQuantity, EAction.EventTime, EAction.Type
+FROM merge.visits_v2
+WHERE
+    StartDate >= '2020-09-17' AND StartDate <= '2020-09-25'
+    AND CounterID = 24226447
+    AND intHash32(UserID) = 416638616 AND intHash64(UserID) = 13269091395366875299
+    AND VisitID IN (5653048135597886819, 5556254872710352304, 5516214175671455313, 5476714937521999313, 5464051549483503043)
+    AND Sign = 1
+"