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https://github.com/ClickHouse/ClickHouse.git
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102 lines
3.5 KiB
C++
102 lines
3.5 KiB
C++
#pragma once
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#include <Parsers/IAST.h>
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#include <Core/Names.h>
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namespace DB
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{
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struct ASTTablesInSelectQueryElement;
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struct StorageID;
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/** SELECT query
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*/
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class ASTSelectQuery : public IAST
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{
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public:
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enum class Expression : uint8_t
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{
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WITH,
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SELECT,
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TABLES,
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PREWHERE,
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WHERE,
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GROUP_BY,
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HAVING,
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ORDER_BY,
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LIMIT_BY_OFFSET,
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LIMIT_BY_LENGTH,
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LIMIT_BY,
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LIMIT_OFFSET,
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LIMIT_LENGTH,
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SETTINGS
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};
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/** Get the text that identifies this element. */
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String getID(char) const override { return "SelectQuery"; }
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ASTPtr clone() const override;
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bool distinct = false;
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bool group_by_with_totals = false;
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bool group_by_with_rollup = false;
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bool group_by_with_cube = false;
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bool limit_with_ties = false;
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ASTPtr & refSelect() { return getExpression(Expression::SELECT); }
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ASTPtr & refTables() { return getExpression(Expression::TABLES); }
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ASTPtr & refPrewhere() { return getExpression(Expression::PREWHERE); }
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ASTPtr & refWhere() { return getExpression(Expression::WHERE); }
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ASTPtr & refHaving() { return getExpression(Expression::HAVING); }
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const ASTPtr with() const { return getExpression(Expression::WITH); }
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const ASTPtr select() const { return getExpression(Expression::SELECT); }
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const ASTPtr tables() const { return getExpression(Expression::TABLES); }
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const ASTPtr prewhere() const { return getExpression(Expression::PREWHERE); }
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const ASTPtr where() const { return getExpression(Expression::WHERE); }
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const ASTPtr groupBy() const { return getExpression(Expression::GROUP_BY); }
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const ASTPtr having() const { return getExpression(Expression::HAVING); }
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const ASTPtr orderBy() const { return getExpression(Expression::ORDER_BY); }
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const ASTPtr limitByOffset() const { return getExpression(Expression::LIMIT_BY_OFFSET); }
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const ASTPtr limitByLength() const { return getExpression(Expression::LIMIT_BY_LENGTH); }
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const ASTPtr limitBy() const { return getExpression(Expression::LIMIT_BY); }
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const ASTPtr limitOffset() const { return getExpression(Expression::LIMIT_OFFSET); }
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const ASTPtr limitLength() const { return getExpression(Expression::LIMIT_LENGTH); }
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const ASTPtr settings() const { return getExpression(Expression::SETTINGS); }
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/// Set/Reset/Remove expression.
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void setExpression(Expression expr, ASTPtr && ast);
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ASTPtr getExpression(Expression expr, bool clone = false) const
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{
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auto it = positions.find(expr);
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if (it != positions.end())
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return clone ? children[it->second]->clone() : children[it->second];
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return {};
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}
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/// Compatibility with old parser of tables list. TODO remove
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ASTPtr sampleSize() const;
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ASTPtr sampleOffset() const;
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ASTPtr arrayJoinExpressionList(bool & is_left) const;
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ASTPtr arrayJoinExpressionList() const;
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const ASTTablesInSelectQueryElement * join() const;
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bool final() const;
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bool withFill() const;
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void replaceDatabaseAndTable(const String & database_name, const String & table_name);
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void replaceDatabaseAndTable(const StorageID & table_id);
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void addTableFunction(ASTPtr & table_function_ptr);
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protected:
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void formatImpl(const FormatSettings & settings, FormatState & state, FormatStateStacked frame) const override;
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private:
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std::unordered_map<Expression, size_t> positions;
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ASTPtr & getExpression(Expression expr);
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};
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}
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