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#pragma once
#include <Analyzer/IQueryTreeNode.h>
#include <Analyzer/Identifier.h>
#include <Analyzer/TableExpressionModifiers.h>
namespace DB
{
/** Identifier node represents identifier in query tree.
* Example: SELECT a FROM test_table.
* a - is identifier.
* test_table - is identifier.
*
* Identifier resolution must be done during query analysis pass.
*/
class IdentifierNode final : public IQueryTreeNode
{
public:
/// Construct identifier node with identifier
explicit IdentifierNode(Identifier identifier_);
/** Construct identifier node with identifier and table expression modifiers
* when identifier node is part of JOIN TREE.
*
* Example: SELECT * FROM test_table SAMPLE 0.1 OFFSET 0.1 FINAL
*/
explicit IdentifierNode(Identifier identifier_, TableExpressionModifiers table_expression_modifiers_);
/// Get identifier
const Identifier & getIdentifier() const
{
return identifier;
}
/// Return true if identifier node has table expression modifiers, false otherwise
bool hasTableExpressionModifiers() const
{
return table_expression_modifiers.has_value();
}
/// Get table expression modifiers
const std::optional<TableExpressionModifiers> & getTableExpressionModifiers() const
{
return table_expression_modifiers;
}
QueryTreeNodeType getNodeType() const override
{
return QueryTreeNodeType::IDENTIFIER;
}
void dumpTreeImpl(WriteBuffer & buffer, FormatState & format_state, size_t indent) const override;
protected:
bool isEqualImpl(const IQueryTreeNode & rhs) const override;
void updateTreeHashImpl(HashState & state) const override;
QueryTreeNodePtr cloneImpl() const override;
ASTPtr toASTImpl(const ConvertToASTOptions & options) const override;
private:
Identifier identifier;
std::optional<TableExpressionModifiers> table_expression_modifiers;
static constexpr size_t children_size = 0;
};
}
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