mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-12-15 02:41:59 +00:00
57 lines
1.8 KiB
C++
57 lines
1.8 KiB
C++
#include "addTypeConversionToAST.h"
|
|
|
|
#include <Parsers/ASTLiteral.h>
|
|
#include <Parsers/ASTFunction.h>
|
|
#include <Parsers/ASTExpressionList.h>
|
|
#include <Parsers/ASTWithAlias.h>
|
|
#include <Storages/ColumnsDescription.h>
|
|
#include <Interpreters/Context.h>
|
|
#include <Interpreters/TreeRewriter.h>
|
|
#include <Interpreters/ExpressionAnalyzer.h>
|
|
#include <Interpreters/ExpressionActions.h>
|
|
|
|
namespace DB
|
|
{
|
|
|
|
namespace ErrorCodes
|
|
{
|
|
extern const int THERE_IS_NO_DEFAULT_VALUE;
|
|
}
|
|
|
|
ASTPtr addTypeConversionToAST(ASTPtr && ast, const String & type_name)
|
|
{
|
|
auto func = makeASTFunction("_CAST", ast, std::make_shared<ASTLiteral>(type_name));
|
|
|
|
if (ASTWithAlias * ast_with_alias = dynamic_cast<ASTWithAlias *>(ast.get()))
|
|
{
|
|
func->alias = ast_with_alias->alias;
|
|
func->prefer_alias_to_column_name = ast_with_alias->prefer_alias_to_column_name;
|
|
ast_with_alias->alias.clear();
|
|
}
|
|
|
|
return func;
|
|
}
|
|
|
|
ASTPtr addTypeConversionToAST(ASTPtr && ast, const String & type_name, const NamesAndTypesList & all_columns, ContextPtr context)
|
|
{
|
|
auto syntax_analyzer_result = TreeRewriter(context).analyze(ast, all_columns);
|
|
const auto actions = ExpressionAnalyzer(ast,
|
|
syntax_analyzer_result,
|
|
const_pointer_cast<Context>(context)).getActions(true);
|
|
|
|
for (const auto & action : actions->getActions())
|
|
if (action.node->type == ActionsDAG::ActionType::ARRAY_JOIN)
|
|
throw Exception("Unsupported default value that requires ARRAY JOIN action", ErrorCodes::THERE_IS_NO_DEFAULT_VALUE);
|
|
|
|
auto block = actions->getSampleBlock();
|
|
|
|
auto desc_type = block.getByName(ast->getAliasOrColumnName()).type;
|
|
if (desc_type->getName() != type_name)
|
|
return addTypeConversionToAST(std::move(ast), type_name);
|
|
|
|
return std::move(ast);
|
|
}
|
|
|
|
|
|
}
|