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Merged
serprex merged 1 commit into from
May 27, 2026
Merged

pushdown for new functions in pg_re2 0.3 #232

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6 changes: 6 additions & 0 deletions CHANGELOG.md
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Expand Up @@ -17,8 +17,14 @@ All notable changes to this project will be documented in this file. It uses the
and PostgreSQL multidimensional arrays inserted into ClickHouse
`Array(Array(...))` columns preserve their nesting. Thanks to Philip Dubé
for the PR ([#233]).
* Added pushdown for [re2 extension] functions introduced in pg_re2 0.3:
`re2extractallgroupshorizontal`, `re2extractallgroupsvertical`,
`re2regexpquotemeta`, and `re2splitbyregexp`. Thanks to Philip Dubé for
the PR ([#232]).

[v0.3.1]: https://github.com/ClickHouse/pg_clickhouse/compare/v0.3.0...v0.3.1
[#232]: https://github.com/ClickHouse/pg_clickhouse/pull/232
"ClickHouse/pg_clickhouse#232 pushdown for new functions in pg_re2 0.3"
[#233]: https://github.com/ClickHouse/pg_clickhouse/pull/233
"ClickHouse/pg_clickhouse#233 Support multidimensional arrays"

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4 changes: 4 additions & 0 deletions src/custom_types.c
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Expand Up @@ -310,13 +310,17 @@ static char *re2_func_map[][2] = {
{"countmatches", "countMatches"},
{"countmatchescaseinsensitive", "countMatchesCaseInsensitive"},
{"extractall", "extractAll"},
{"extractallgroupshorizontal", "extractAllGroupsHorizontal"},
{"extractallgroupsvertical", "extractAllGroupsVertical"},
{"extractgroups", "extractGroups"},
{"multimatchallindices", "multiMatchAllIndices"},
{"multimatchany", "multiMatchAny"},
{"multimatchanyindex", "multiMatchAnyIndex"},
{"regexpextract", "regexpExtract"},
{"regexpquotemeta", "regexpQuoteMeta"},
{"replaceregexpall", "replaceRegexpAll"},
{"replaceregexpone", "replaceRegexpOne"},
{"splitbyregexp", "splitByRegexp"},
{NULL, NULL},
};

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81 changes: 81 additions & 0 deletions test/expected/re2_functions.out
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Expand Up @@ -275,6 +275,87 @@ SELECT * FROM t1 WHERE re2multimatchallindices(val, VARIADIC ARRAY['POSIX','PCRE
1 | POSIX uses BRE and ERE
(1 row)

EXPLAIN (VERBOSE, COSTS OFF)
SELECT id FROM t1 WHERE re2regexpquotemeta(val || '.') = val || '\.';
QUERY PLAN
---------------------------------------------------------------------------------------------------
Foreign Scan on re2_test.t1
Output: id
Remote SQL: SELECT id FROM re2_test.t1 WHERE ((regexpQuoteMeta((val || '.')) = (val || '\\.')))
(3 rows)

SELECT id FROM t1 WHERE re2regexpquotemeta(val || '.') = val || '\.';
id
----
1
2
3
(3 rows)

EXPLAIN (VERBOSE, COSTS OFF)
SELECT id FROM t1 WHERE re2splitbyregexp(' ', val) = ARRAY['re2','uses','finite','automata'];
QUERY PLAN
--------------------------------------------------------------------------------------------------------------------
Foreign Scan on re2_test.t1
Output: id
Remote SQL: SELECT id FROM re2_test.t1 WHERE ((splitByRegexp(' ', val, 0) = ['re2','uses','finite','automata']))
(3 rows)

SELECT id FROM t1 WHERE re2splitbyregexp(' ', val) = ARRAY['re2','uses','finite','automata'];
id
----
2
(1 row)

EXPLAIN (VERBOSE, COSTS OFF)
SELECT id FROM t1 WHERE re2splitbyregexp(' ', val, 2) = ARRAY['re2','uses'];
QUERY PLAN
------------------------------------------------------------------------------------------------
Foreign Scan on re2_test.t1
Output: id
Remote SQL: SELECT id FROM re2_test.t1 WHERE ((splitByRegexp(' ', val, 2) = ['re2','uses']))
(3 rows)

SELECT id FROM t1 WHERE re2splitbyregexp(' ', val, 2) = ARRAY['re2','uses'];
id
----
2
(1 row)

EXPLAIN (VERBOSE, COSTS OFF)
SELECT id FROM t1 WHERE array_length(re2extractallgroupsvertical(val, '(\w+) (\w+)'), 1) > 0;
QUERY PLAN
---------------------------------------------------------------------------------------------------------------
Foreign Scan on re2_test.t1
Output: id
Remote SQL: SELECT id FROM re2_test.t1 WHERE ((length(extractAllGroupsVertical(val, '(\\w+) (\\w+)')) > 0))
(3 rows)

SELECT id FROM t1 WHERE array_length(re2extractallgroupsvertical(val, '(\w+) (\w+)'), 1) > 0;
id
----
1
2
3
(3 rows)

EXPLAIN (VERBOSE, COSTS OFF)
SELECT id FROM t1 WHERE array_length(re2extractallgroupshorizontal(val, '(\w+) (\w+)'), 1) = 2;
QUERY PLAN
-----------------------------------------------------------------------------------------------------------------
Foreign Scan on re2_test.t1
Output: id
Remote SQL: SELECT id FROM re2_test.t1 WHERE ((length(extractAllGroupsHorizontal(val, '(\\w+) (\\w+)')) = 2))
(3 rows)

SELECT id FROM t1 WHERE array_length(re2extractallgroupshorizontal(val, '(\w+) (\w+)'), 1) = 2;
id
----
1
2
3
(3 rows)

DROP EXTENSION re2;
DROP USER MAPPING FOR CURRENT_USER SERVER re2_svr;
SELECT clickhouse_raw_query('DROP DATABASE re2_test');
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20 changes: 20 additions & 0 deletions test/sql/re2_functions.sql
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Expand Up @@ -85,6 +85,26 @@ EXPLAIN (VERBOSE, COSTS OFF)
SELECT * FROM t1 WHERE re2multimatchallindices(val, VARIADIC ARRAY['POSIX','PCRE']) = ARRAY[1];
SELECT * FROM t1 WHERE re2multimatchallindices(val, VARIADIC ARRAY['POSIX','PCRE']) = ARRAY[1];

EXPLAIN (VERBOSE, COSTS OFF)
SELECT id FROM t1 WHERE re2regexpquotemeta(val || '.') = val || '\.';
SELECT id FROM t1 WHERE re2regexpquotemeta(val || '.') = val || '\.';

EXPLAIN (VERBOSE, COSTS OFF)
SELECT id FROM t1 WHERE re2splitbyregexp(' ', val) = ARRAY['re2','uses','finite','automata'];
SELECT id FROM t1 WHERE re2splitbyregexp(' ', val) = ARRAY['re2','uses','finite','automata'];

EXPLAIN (VERBOSE, COSTS OFF)
SELECT id FROM t1 WHERE re2splitbyregexp(' ', val, 2) = ARRAY['re2','uses'];
SELECT id FROM t1 WHERE re2splitbyregexp(' ', val, 2) = ARRAY['re2','uses'];

EXPLAIN (VERBOSE, COSTS OFF)
SELECT id FROM t1 WHERE array_length(re2extractallgroupsvertical(val, '(\w+) (\w+)'), 1) > 0;
SELECT id FROM t1 WHERE array_length(re2extractallgroupsvertical(val, '(\w+) (\w+)'), 1) > 0;

EXPLAIN (VERBOSE, COSTS OFF)
SELECT id FROM t1 WHERE array_length(re2extractallgroupshorizontal(val, '(\w+) (\w+)'), 1) = 2;
SELECT id FROM t1 WHERE array_length(re2extractallgroupshorizontal(val, '(\w+) (\w+)'), 1) = 2;

DROP EXTENSION re2;
DROP USER MAPPING FOR CURRENT_USER SERVER re2_svr;
SELECT clickhouse_raw_query('DROP DATABASE re2_test');
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