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Fix "No available columns" for Merge() storage

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This commit is contained in:
Azat Khuzhin 2021-06-28 23:08:18 +03:00
parent d9c46003cb
commit 15a14d6da2
3 changed files with 5 additions and 1 deletions
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2
src/Interpreters/TreeRewriter.cpp
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@ -742,7 +742,7 @@ void TreeRewriterResult::collectUsedColumns(const ASTPtr & query, bool is_select
if (!columns.empty()) if (!columns.empty())
required.insert(std::min_element(columns.begin(), columns.end())->name); required.insert(std::min_element(columns.begin(), columns.end())->name);
else else if (!source_columns.empty())
/// If we have no information about columns sizes, choose a column of minimum size of its data type. /// If we have no information about columns sizes, choose a column of minimum size of its data type.
required.insert(ExpressionActions::getSmallestColumn(source_columns)); required.insert(ExpressionActions::getSmallestColumn(source_columns));
} }

0
tests/queries/0_stateless/01931_storage_merge_no_columns.reference Normal file
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4
tests/queries/0_stateless/01931_storage_merge_no_columns.sql Normal file
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@ -0,0 +1,4 @@
drop table if exists data;
create table data (key Int) engine=MergeTree() order by key;
select 1 from merge(currentDatabase(), '^data$') prewhere _table in (NULL);
drop table data;