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mJOIN: correct names for left table columns

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This commit is contained in:
chertus 2019-02-21 15:45:31 +03:00
parent b2fa415858
commit 10b473bb24
2 changed files with 14 additions and 7 deletions
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15
dbms/src/Interpreters/JoinToSubqueryTransformVisitor.cpp
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@ -35,19 +35,21 @@ struct ColumnAliasesMatcher
struct Data
{
const std::vector<DatabaseAndTableWithAlias> tables;
bool public_names;
AsteriskSemantic::RevertedAliases rev_aliases;
std::unordered_map<String, String> aliases;
std::vector<ASTIdentifier *> compound_identifiers;
std::vector<std::pair<ASTIdentifier *, bool>> compound_identifiers;
Data(std::vector<DatabaseAndTableWithAlias> && tables_)
: tables(tables_)
, public_names(false)
{}
void replaceIdentifiersWithAliases()
{
String hide_prefix = "--"; /// @note restriction: user should not use alises like `--table.column`
for (auto * identifier : compound_identifiers)
for (auto & [identifier, is_public] : compound_identifiers)
{
auto it = rev_aliases.find(identifier->name);
if (it == rev_aliases.end())
@ -61,7 +63,8 @@ struct ColumnAliasesMatcher
rev_aliases[long_name].push_back(alias);
identifier->setShortName(alias);
//identifier->setAlias(long_name);
if (is_public)
identifier->setAlias(long_name);
}
}
else
@ -130,7 +133,7 @@ struct ColumnAliasesMatcher
}
}
else
data.compound_identifiers.push_back(&node);
data.compound_identifiers.emplace_back(&node, data.public_names);
}
};
@ -236,7 +239,11 @@ void JoinToSubqueryTransformMatcher::visit(ASTSelectQuery & select, ASTPtr &, Da
ColumnAliasesVisitor::Data aliases_data(getDatabaseAndTables(select, ""));
if (select.select_expression_list)
{
aliases_data.public_names = true;
ColumnAliasesVisitor(aliases_data).visit(select.select_expression_list);
aliases_data.public_names = false;
}
if (select.where_expression)
ColumnAliasesVisitor(aliases_data).visit(select.where_expression);
if (select.prewhere_expression)

6
dbms/tests/queries/0_stateless/00820_multiple_joins.reference
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@ -5,9 +5,9 @@
0 0 0
10 100 1000
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┌─--t1.a─┬─--t2.a─┬─--t2.b─┬─--t3.b─┬─--t3.c─┬─a─┬─b─┬─c─┐
│ 0 │ 0 │ 0 │ 0 │ 0 │ 0 │ 0 │ 0 │
└────────┴────────┴────────┴────────┴────────┴───┴───┴───┘
┌─t1.a─┬─t2.a─┬─t2.b─┬─t3.b─┬─t3.c─┬─a─┬─b─┬─c─┐
│ 0 │ 0 │ 0 │ 0 │ 0 │ 0 │ 0 │ 0 │
└──────┴──────┴──────┴──────┴──────┴───┴───┴───┘
0 0 0 0
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