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#pragma once
#include <Parsers/IParserBase.h>
namespace DB
{
struct ASTTableJoin;
/** List of single or multiple JOIN-ed tables or subqueries in SELECT query, with ARRAY JOINs and SAMPLE, FINAL modifiers.
*/
class ParserTablesInSelectQuery : public IParserBase
{
public:
explicit ParserTablesInSelectQuery(bool allow_alias_without_as_keyword_ = true)
: allow_alias_without_as_keyword(allow_alias_without_as_keyword_) {}
protected:
const char * getName() const override { return "table, table function, subquery or list of joined tables"; }
bool parseImpl(Pos & pos, ASTPtr & node, Expected & expected) override;
private:
bool allow_alias_without_as_keyword;
};
class ParserTablesInSelectQueryElement : public IParserBase
{
public:
explicit ParserTablesInSelectQueryElement(bool is_first_, bool allow_alias_without_as_keyword_ = true)
: is_first(is_first_), allow_alias_without_as_keyword(allow_alias_without_as_keyword_) {}
protected:
const char * getName() const override { return "table, table function, subquery or list of joined tables"; }
bool parseImpl(Pos & pos, ASTPtr & node, Expected & expected) override;
private:
bool is_first;
bool allow_alias_without_as_keyword;
static void parseJoinStrictness(Pos & pos, ASTTableJoin & table_join);
};
class ParserTableExpression : public IParserBase
{
public:
explicit ParserTableExpression(bool allow_alias_without_as_keyword_ = true)
: allow_alias_without_as_keyword(allow_alias_without_as_keyword_) {}
protected:
const char * getName() const override { return "table or subquery or table function"; }
bool parseImpl(Pos & pos, ASTPtr & node, Expected & expected) override;
private:
bool allow_alias_without_as_keyword;
};
class ParserArrayJoin : public IParserBase
{
protected:
const char * getName() const override { return "array join"; }
bool parseImpl(Pos & pos, ASTPtr & node, Expected & expected) override;
};
}
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