`ALTER TABLE ... FETCH` and `ALTER TABLE ... ATTACH` queries were
disabled in the Replicated database engine, because it could cause
accidental duplication of data.
This enables these queries but without replicating them.
In the case of `FETCH`, the part will only be fetched on the server
where the query is issued.
Similarly, in the case of `ATTACH`, the attached part only needs to
be available on the server where the query is issued.
If the table itself is using one of the Replicated MergeTree engines,
the attached data is then replicated by the table engine itself,
without intervention of the database engine.
This change is meant to help with live backup/restore when using the
Replicated database engine, using FREEZE for backup and ATTACH for
restore.
10 seconds it not enough [1]:
2010_lc_native: [ FAIL ] 15.53 sec. - having stderror:
Traceback (most recent call last):
File "/usr/share/clickhouse-test/queries/0_stateless/2010_lc_native.python", line 302, in <module>
main()
File "/usr/share/clickhouse-test/queries/0_stateless/2010_lc_native.python", line 298, in main
insertLowCardinalityRowWithIndexOverflow()
File "/usr/share/clickhouse-test/queries/0_stateless/2010_lc_native.python", line 259, in insertLowCardinalityRowWithIndexOverflow
readException(s)
File "/usr/share/clickhouse-test/queries/0_stateless/2010_lc_native.python", line 185, in readException
assert(readVarUInt(s) == 2)
File "/usr/share/clickhouse-test/queries/0_stateless/2010_lc_native.python", line 65, in readVarUInt
byte = readStrict(s)[0]
File "/usr/share/clickhouse-test/queries/0_stateless/2010_lc_native.python", line 34, in readStrict
cur = s.recv(size)
socket.timeout: timed out
[1]: https://clickhouse-test-reports.s3.yandex.net/29060/7f1160c466a968c680d1bc73e0ad5e9419d0b6d0/functional_stateless_tests_(debug).html#fail1
Server log:
2021.09.17 21:02:53.734388 [ 682 ] {123456} <Trace> ContextAccess (default): Access granted: INSERT(x) ON test_0tmdh4.tab
2021.09.17 21:03:04.835044 [ 682 ] {123456} <Error> executeQuery: Code: 117. DB::Exception: Index for LowCardinality is out of range. Dictionary size is 1, but found index with value 72057594037927936. (INCORRECT_DATA) (version 21.11.1.8109) (from [::ffff:127.0.0.1]:59512) (in query: insert into test_0tmdh4.tab format TSV settings input_format_defaults_for_omitted_fields=0), Stack trace (when copying this message, always include the lines below):
And according to trace_log the problem is slow unwind:
2021-09-17 21:02:55.103893 libunwind::LocalAddressSpace::get32
2021-09-17 21:02:56.151960 libunwind::LocalAddressSpace::get8
2021-09-17 21:03:03.168447 libunwind::LocalAddressSpace::getULEB128
* Alter mv and lv (en)
* Translated to Russian. Fixes.
* Fixes
* Update docs/en/sql-reference/statements/alter/view.md
Co-authored-by: Ivan Blinkov <github@blinkov.ru>
Co-authored-by: Ivan Blinkov <github@blinkov.ru>
