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Merge branch 'fix_ISSUE5695' of https://github.com/TCeason/ClickHouse into TCeason-fix_ISSUE5695

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This commit is contained in:
Alexey Milovidov 2019-07-25 19:09:18 +03:00
commit 93c7f6aedf
5 changed files with 27 additions and 2 deletions
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3
dbms/src/Core/Settings.h
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@ -307,6 +307,7 @@ struct Settings : public SettingsCollection<Settings>
M(SettingBool, log_query_threads, true, "Log query threads into system.query_thread_log table. This setting have effect only when 'log_queries' is true.") \
M(SettingLogsLevel, send_logs_level, LogsLevel::none, "Send server text logs with specified minimum level to client. Valid values: 'trace', 'debug', 'information', 'warning', 'error', 'none'") \
M(SettingBool, enable_optimize_predicate_expression, 1, "If it is set to true, optimize predicates to subqueries.") \
M(SettingBool, enable_optimize_predicate_expression_to_final_subquery, 1, "Allow push predicate to final subquery.")
\
M(SettingUInt64, low_cardinality_max_dictionary_size, 8192, "Maximum size (in rows) of shared global dictionary for LowCardinality type.") \
M(SettingBool, low_cardinality_use_single_dictionary_for_part, false, "LowCardinality type serialization setting. If is true, than will use additional keys when global dictionary overflows. Otherwise, will create several shared dictionaries.") \
@ -338,7 +339,7 @@ struct Settings : public SettingsCollection<Settings>
\
/** Obsolete settings that do nothing but left for compatibility reasons. Remove each one after half a year of obsolescence. */ \
\
M(SettingBool, allow_experimental_low_cardinality_type, true, "Obsolete setting, does nothing. Will be removed after 2019-08-13")
M(SettingBool, allow_experimental_low_cardinality_type, true, "Obsolete setting, does nothing. Will be removed after 2019-08-13") \
DECLARE_SETTINGS_COLLECTION(LIST_OF_SETTINGS)

5
dbms/src/Interpreters/PredicateExpressionsOptimizer.cpp
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@ -138,7 +138,10 @@ bool PredicateExpressionsOptimizer::allowPushDown(
const std::vector<IdentifierWithQualifier> & dependencies,
OptimizeKind & optimize_kind)
{
if (!subquery || subquery->final() || subquery->limitBy() || subquery->limitLength() || subquery->with())
if (!subquery
|| (!settings.enable_optimize_predicate_expression_to_final_subquery && subquery->final())
|| subquery->limitBy() || subquery->limitLength()
|| subquery->with())
return false;
else
{

2
dbms/src/Interpreters/PredicateExpressionsOptimizer.h
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@ -39,6 +39,7 @@ class PredicateExpressionsOptimizer
/// for PredicateExpressionsOptimizer
const bool enable_optimize_predicate_expression;
const bool enable_optimize_predicate_expression_to_final_subquery;
const bool join_use_nulls;
template<typename T>
@ -47,6 +48,7 @@ class PredicateExpressionsOptimizer
max_expanded_ast_elements(settings.max_expanded_ast_elements),
count_distinct_implementation(settings.count_distinct_implementation),
enable_optimize_predicate_expression(settings.enable_optimize_predicate_expression),
enable_optimize_predicate_expression_to_final_subquery(settings.enable_optimize_predicate_expression_to_final_subquery),
join_use_nulls(settings.join_use_nulls)
{}
};

2
dbms/tests/queries/0_stateless/00974_final_predicate_push_down.reference Normal file
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@ -0,0 +1,2 @@
1
1

17
dbms/tests/queries/0_stateless/00974_final_predicate_push_down.sql Normal file
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@ -0,0 +1,17 @@
DROP TABLE IF EXISTS test_00974;
CREATE TABLE test_00974
(
date Date,
x Int32,
ver UInt64
)
ENGINE = ReplacingMergeTree(date, x, 1);
INSERT INTO test_00974 VALUES ('2019-07-23', 1, 1), ('2019-07-23', 1, 2);
INSERT INTO test_00974 VALUES ('2019-07-23', 2, 1), ('2019-07-23', 2, 2);
SELECT COUNT() FROM (SELECT * FROM test_00974 FINAL) where x = 1 SETTINGS allow_push_predicate_to_final_subquery = 0;
SELECT COUNT() FROM (SELECT * FROM test_00974 FINAL) where x = 1 SETTINGS allow_push_predicate_to_final_subquery = 1, max_rows_to_read = 2;
DROP TABLE test_00974;