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Merge pull request #27932 from amosbird/constkeys

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Add a setting to bring back the old behavior of grouping by constant keys on empty set.
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Kseniia Sumarokova 2021-08-21 08:02:30 +03:00 committed by GitHub
commit 19afb22b4d
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4 changed files with 9 additions and 3 deletions
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1
src/Core/Settings.h
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@ -253,6 +253,7 @@ class IColumn;
M(Bool, use_index_for_in_with_subqueries, true, "Try using an index if there is a subquery or a table expression on the right side of the IN operator.", 0) \
M(Bool, joined_subquery_requires_alias, true, "Force joined subqueries and table functions to have aliases for correct name qualification.", 0) \
M(Bool, empty_result_for_aggregation_by_empty_set, false, "Return empty result when aggregating without keys on empty set.", 0) \
M(Bool, empty_result_for_aggregation_by_constant_keys_on_empty_set, true, "Return empty result when aggregating by constant keys on empty set.", 0) \
M(Bool, allow_distributed_ddl, true, "If it is set to true, then a user is allowed to executed distributed DDL queries.", 0) \
M(Bool, allow_suspicious_codecs, false, "If it is set to true, allow to specify meaningless compression codecs.", 0) \
M(Bool, allow_experimental_codecs, false, "If it is set to true, allow to specify experimental compression codecs (but we don't have those yet and this option does nothing).", 0) \

4
src/Interpreters/InterpreterSelectQuery.cpp
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@ -2080,7 +2080,9 @@ void InterpreterSelectQuery::executeAggregation(QueryPlan & query_plan, const Ac
settings.group_by_two_level_threshold,
settings.group_by_two_level_threshold_bytes,
settings.max_bytes_before_external_group_by,
settings.empty_result_for_aggregation_by_empty_set || (keys.empty() && query_analyzer->hasConstAggregationKeys()),
settings.empty_result_for_aggregation_by_empty_set
|| (settings.empty_result_for_aggregation_by_constant_keys_on_empty_set && keys.empty()
&& query_analyzer->hasConstAggregationKeys()),
context->getTemporaryVolume(),
settings.max_threads,
settings.min_free_disk_space_for_temporary_data,

1
tests/queries/0_stateless/01925_test_group_by_const_consistency.reference
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@ -1 +1,2 @@
0
1 0

6
tests/queries/0_stateless/01925_test_group_by_const_consistency.sql
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@ -1,2 +1,4 @@
SELECT 1 as a, count() FROM numbers(10)　WHERE 0 GROUP BY a;
SELECT count() FROM numbers(10) WHERE 0
SELECT 1 as a, count() FROM numbers(10) WHERE 0 GROUP BY a;
SELECT count() FROM numbers(10) WHERE 0;
SELECT 1 as a, count() FROM numbers(10) WHERE 0 GROUP BY a SETTINGS empty_result_for_aggregation_by_constant_keys_on_empty_set = 0;