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Merge pull request #21550 from amosbird/shardpruningliteral

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Shard pruning via literals
This commit is contained in:
Nikolai Kochetov 2021-03-24 13:59:34 +03:00 committed by GitHub
commit 6ca8a66da2
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3 changed files with 24 additions and 2 deletions
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10
src/Interpreters/evaluateConstantExpression.cpp
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@ -290,8 +290,6 @@ std::optional<Blocks> evaluateExpressionOverConstantCondition(const ASTPtr & nod
{
Blocks result;
// TODO: `node` may be always-false literal.
if (const auto * fn = node->as<ASTFunction>())
{
const auto dnf = analyzeFunction(fn, target_expr);
@ -350,6 +348,14 @@ std::optional<Blocks> evaluateExpressionOverConstantCondition(const ASTPtr & nod
}
}
}
else if (const auto * literal = node->as<ASTLiteral>())
{
// Check if it's always true or false.
if (literal->value.getType() == Field::Types::UInt64 && literal->value.get<UInt64>() == 0)
return {result};
else
return {};
}
return {result};
}

2
tests/queries/0_stateless/01755_shard_pruning_with_literal.reference Normal file
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@ -0,0 +1,2 @@
1
1

14
tests/queries/0_stateless/01755_shard_pruning_with_literal.sql Normal file
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@ -0,0 +1,14 @@
set optimize_skip_unused_shards=1;
drop table if exists data_01755;
drop table if exists dist_01755;
create table data_01755 (i Int) Engine=Memory;
create table dist_01755 as data_01755 Engine=Distributed(test_cluster_two_shards, currentDatabase(), data_01755, i);
insert into data_01755 values (1);
select * from dist_01755 where 1 settings enable_early_constant_folding = 0;
drop table if exists data_01755;
drop table if exists dist_01755;