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#pragma once
#include <Core/Field.h>
#include <Analyzer/IQueryTreeNode.h>
#include <Analyzer/ConstantValue.h>
namespace DB
{
/** Constant node represents constant value in query tree.
* Constant value must be representable by Field.
* Examples: 1, 'constant_string', [1,2,3].
*
* Constant node can optionally keep pointer to its source expression.
*/
class ConstantNode;
using ConstantNodePtr = std::shared_ptr<ConstantNode>;
class ConstantNode final : public IQueryTreeNode
{
public:
/// Construct constant query tree node from constant value and source expression
explicit ConstantNode(ConstantValuePtr constant_value_, QueryTreeNodePtr source_expression);
/// Construct constant query tree node from constant value
explicit ConstantNode(ConstantValuePtr constant_value_);
/** Construct constant query tree node from field and data type.
*
* Throws exception if value cannot be converted to value data type.
*/
explicit ConstantNode(Field value_, DataTypePtr value_data_type_);
/// Construct constant query tree node from field, data type will be derived from field value
explicit ConstantNode(Field value_);
/// Get constant value
const Field & getValue() const
{
return constant_value->getValue();
}
/// Get constant value string representation
const String & getValueStringRepresentation() const
{
return value_string;
}
/// Returns true if constant node has source expression, false otherwise
bool hasSourceExpression() const
{
return source_expression != nullptr;
}
/// Get source expression
const QueryTreeNodePtr & getSourceExpression() const
{
return source_expression;
}
/// Get source expression
QueryTreeNodePtr & getSourceExpression()
{
return source_expression;
}
QueryTreeNodeType getNodeType() const override
{
return QueryTreeNodeType::CONSTANT;
}
DataTypePtr getResultType() const override
{
return constant_value->getType();
}
void dumpTreeImpl(WriteBuffer & buffer, FormatState & format_state, size_t indent) const override;
protected:
bool isEqualImpl(const IQueryTreeNode & rhs) const override;
void updateTreeHashImpl(HashState & hash_state) const override;
QueryTreeNodePtr cloneImpl() const override;
ASTPtr toASTImpl(const ConvertToASTOptions & options) const override;
private:
ConstantValuePtr constant_value;
String value_string;
QueryTreeNodePtr source_expression;
static constexpr size_t children_size = 0;
};
}
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