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Merge pull request #42883 from zzsmdfj/fix_join_to_subqueries_null_pointer

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Fix  join to subqueries rewriter null pointer
This commit is contained in:
Nikolay Degterinsky 2022-11-04 19:56:40 +03:00 committed by GitHub
commit 6995fa1afd
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3 changed files with 13 additions and 4 deletions
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11
src/Interpreters/JoinToSubqueryTransformVisitor.cpp
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@ -546,10 +546,13 @@ std::vector<TableNeededColumns> normalizeColumnNamesExtractNeeded(
{
auto alias = aliases.find(ident->name())->second;
auto alias_ident = alias->clone();
alias_ident->as<ASTIdentifier>()->restoreTable();
bool alias_equals_column_name = alias_ident->getColumnNameWithoutAlias() == ident->getColumnNameWithoutAlias();
if (!alias_equals_column_name)
throw Exception("Alias clashes with qualified column '" + ident->name() + "'", ErrorCodes::AMBIGUOUS_COLUMN_NAME);
if (auto * alias_ident_typed = alias_ident->as<ASTIdentifier>())
{
alias_ident_typed->restoreTable();
bool alias_equals_column_name = alias_ident->getColumnNameWithoutAlias() == ident->getColumnNameWithoutAlias();
if (!alias_equals_column_name)
throw Exception("Alias clashes with qualified column '" + ident->name() + "'", ErrorCodes::AMBIGUOUS_COLUMN_NAME);
}
}
String short_name = ident->shortName();
String original_long_name;

1
tests/queries/0_stateless/01839_join_to_subqueries_rewriter_columns_matcher.reference
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@ -1 +1,2 @@
b
a b c

5
tests/queries/0_stateless/01839_join_to_subqueries_rewriter_columns_matcher.sql
View File

@ -1,3 +1,8 @@
SELECT (if(a.test == 'a', b.test, c.test)) as `a.test` FROM
(SELECT 1 AS id, 'a' AS test) a
LEFT JOIN (SELECT 1 AS id, 'b' AS test) b ON b.id = a.id
LEFT JOIN (SELECT 1 AS id, 'c' AS test) c ON c.id = a.id;
SELECT COLUMNS('test') FROM
(SELECT 1 AS id, 'a' AS test) a
LEFT JOIN (SELECT 1 AS id, 'b' AS test) b ON b.id = a.id