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116 lines
3.8 KiB
C++
116 lines
3.8 KiB
C++
#include <Common/checkStackSize.h>
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#include <Interpreters/ApplyWithSubqueryVisitor.h>
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#include <Interpreters/IdentifierSemantic.h>
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#include <Interpreters/StorageID.h>
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#include <Interpreters/misc.h>
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#include <Parsers/ASTFunction.h>
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#include <Parsers/ASTIdentifier.h>
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#include <Parsers/ASTSelectQuery.h>
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#include <Parsers/ASTSelectWithUnionQuery.h>
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#include <Parsers/ASTSubquery.h>
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#include <Parsers/ASTTablesInSelectQuery.h>
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#include <Parsers/ASTWithElement.h>
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namespace DB
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{
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void ApplyWithSubqueryVisitor::visit(ASTPtr & ast, const Data & data)
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{
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checkStackSize();
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if (auto * node_select = ast->as<ASTSelectQuery>())
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visit(*node_select, data);
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else
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{
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for (auto & child : ast->children)
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visit(child, data);
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if (auto * node_func = ast->as<ASTFunction>())
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visit(*node_func, data);
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else if (auto * node_table = ast->as<ASTTableExpression>())
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visit(*node_table, data);
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}
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}
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void ApplyWithSubqueryVisitor::visit(ASTSelectQuery & ast, const Data & data)
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{
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std::optional<Data> new_data;
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if (auto with = ast.with())
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{
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for (auto & child : with->children)
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{
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visit(child, new_data ? *new_data : data);
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if (auto * ast_with_elem = child->as<ASTWithElement>())
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{
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if (!new_data)
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new_data = data;
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new_data->subqueries[ast_with_elem->name] = ast_with_elem->subquery;
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}
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}
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}
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for (auto & child : ast.children)
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{
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if (child != ast.with())
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visit(child, new_data ? *new_data : data);
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}
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}
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void ApplyWithSubqueryVisitor::visit(ASTSelectWithUnionQuery & ast, const Data & data)
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{
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for (auto & child : ast.children)
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visit(child, data);
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}
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void ApplyWithSubqueryVisitor::visit(ASTTableExpression & table, const Data & data)
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{
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if (table.database_and_table_name)
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{
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auto table_id = table.database_and_table_name->as<ASTTableIdentifier>()->getTableId();
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if (table_id.database_name.empty())
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{
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auto subquery_it = data.subqueries.find(table_id.table_name);
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if (subquery_it != data.subqueries.end())
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{
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auto old_alias = table.database_and_table_name->tryGetAlias();
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table.children.clear();
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table.database_and_table_name.reset();
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table.subquery = subquery_it->second->clone();
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table.subquery->as<ASTSubquery &>().cte_name = table_id.table_name;
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if (!old_alias.empty())
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table.subquery->setAlias(old_alias);
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table.children.emplace_back(table.subquery);
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}
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}
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}
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}
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void ApplyWithSubqueryVisitor::visit(ASTFunction & func, const Data & data)
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{
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/// Special CTE case, where the right argument of IN is alias (ASTIdentifier) from WITH clause.
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if (checkFunctionIsInOrGlobalInOperator(func))
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{
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auto & ast = func.arguments->children.at(1);
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if (const auto * identifier = ast->as<ASTIdentifier>())
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{
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if (identifier->isShort())
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{
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/// Clang-tidy is wrong on this line, because `func.arguments->children.at(1)` gets replaced before last use of `name`.
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auto name = identifier->shortName(); // NOLINT
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auto subquery_it = data.subqueries.find(name);
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if (subquery_it != data.subqueries.end())
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{
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auto old_alias = func.arguments->children[1]->tryGetAlias();
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func.arguments->children[1] = subquery_it->second->clone();
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func.arguments->children[1]->as<ASTSubquery &>().cte_name = name;
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if (!old_alias.empty())
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func.arguments->children[1]->setAlias(old_alias);
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}
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}
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}
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}
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}
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}
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