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#pragma once
#include <Analyzer/IQueryTreeNode.h>
#include <Analyzer/ListNode.h>
namespace DB
{
/** Interpolate node represents expression interpolation in INTERPOLATE section that is part of ORDER BY section in query tree.
*
* Example: SELECT * FROM test_table ORDER BY id WITH FILL INTERPOLATE (value AS value + 1);
* value - expression to interpolate.
* value + 1 - interpolate expression.
*/
class InterpolateNode;
using InterpolateNodePtr = std::shared_ptr<InterpolateNode>;
class InterpolateNode final : public IQueryTreeNode
{
public:
/// Initialize interpolate node with expression and interpolate expression
explicit InterpolateNode(QueryTreeNodePtr expression_, QueryTreeNodePtr interpolate_expression_);
/// Get expression to interpolate
const QueryTreeNodePtr & getExpression() const
{
return children[expression_child_index];
}
/// Get expression to interpolate
QueryTreeNodePtr & getExpression()
{
return children[expression_child_index];
}
/// Get interpolate expression
const QueryTreeNodePtr & getInterpolateExpression() const
{
return children[interpolate_expression_child_index];
}
/// Get interpolate expression
QueryTreeNodePtr & getInterpolateExpression()
{
return children[interpolate_expression_child_index];
}
QueryTreeNodeType getNodeType() const override
{
return QueryTreeNodeType::INTERPOLATE;
}
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:
static constexpr size_t expression_child_index = 0;
static constexpr size_t interpolate_expression_child_index = 1;
static constexpr size_t children_size = interpolate_expression_child_index + 1;
};
}
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