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anonymous_namespace{RelAlgDagBuilder.cpp}::WindowFunctionDetectionVisitor Class Reference
+ Inheritance diagram for anonymous_namespace{RelAlgDagBuilder.cpp}::WindowFunctionDetectionVisitor:
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Protected Member Functions

const RexScalarvisitOperator (const RexOperator *rex_operator) const final
 
const RexScalarvisitCase (const RexCase *rex_case) const final
 
const RexScalaraggregateResult (const RexScalar *const &aggregate, const RexScalar *const &next_result) const final
 
const RexScalardefaultResult () const final
 
- Protected Member Functions inherited from RexVisitor< const RexScalar *>
const RexScalardefaultResult () const override
 

Additional Inherited Members

- Public Member Functions inherited from RexVisitor< const RexScalar *>
const RexScalarvisitInput (const RexInput *) const override
 
const RexScalarvisitLiteral (const RexLiteral *) const override
 
const RexScalarvisitSubQuery (const RexSubQuery *) const override
 
const RexScalarvisitRef (const RexRef *) const override
 
const RexScalarvisitOperator (const RexOperator *rex_operator) const override
 
const RexScalarvisitCase (const RexCase *rex_case) const override
 
- Public Member Functions inherited from RexVisitorBase< const RexScalar * >
virtual const RexScalarvisit (const RexScalar *rex_scalar) const
 

Detailed Description

WindowFunctionDetectionVisitor detects the presence of embedded Window Function Rex Operators and returns a pointer to the WindowFunctionOperator. Only the first detected operator will be returned (e.g. a binary operator that is WindowFunc1 & WindowFunc2 would return a pointer to WindowFunc1). Neither the window function operator nor its parent expression are modified.

Definition at line 1707 of file RelAlgDagBuilder.cpp.

Member Function Documentation

◆ aggregateResult()

const RexScalar* anonymous_namespace{RelAlgDagBuilder.cpp}::WindowFunctionDetectionVisitor::aggregateResult ( const RexScalar *const &  aggregate,
const RexScalar *const &  next_result 
) const
inlinefinalprotectedvirtual

Reimplemented from RexVisitor< const RexScalar *>.

Definition at line 1761 of file RelAlgDagBuilder.cpp.

References UNREACHABLE.

1762  {
1763  // all methods calling aggregate result should be overriden
1764  UNREACHABLE();
1765  return nullptr;
1766  }
#define UNREACHABLE()
Definition: Logger.h:241

◆ defaultResult()

const RexScalar* anonymous_namespace{RelAlgDagBuilder.cpp}::WindowFunctionDetectionVisitor::defaultResult ( ) const
inlinefinalprotectedvirtual

Implements RexVisitorBase< const RexScalar * >.

Definition at line 1768 of file RelAlgDagBuilder.cpp.

1768 { return nullptr; }

◆ visitCase()

const RexScalar* anonymous_namespace{RelAlgDagBuilder.cpp}::WindowFunctionDetectionVisitor::visitCase ( const RexCase rex_case) const
inlinefinalprotectedvirtual

Implements RexVisitorBase< const RexScalar * >.

Definition at line 1736 of file RelAlgDagBuilder.cpp.

References anonymous_namespace{RelAlgDagBuilder.cpp}::anonymous_namespace{RelAlgDagBuilder.cpp}::is_window_function_operator(), and run_benchmark_import::result.

1736  {
1737  if (is_window_function_operator(rex_case)) {
1738  return rex_case;
1739  }
1740 
1741  auto result = defaultResult();
1742  for (size_t i = 0; i < rex_case->branchCount(); ++i) {
1743  const auto when = rex_case->getWhen(i);
1744  result = is_window_function_operator(when) ? when : visit(when);
1745  if (result) {
1746  return result;
1747  }
1748  const auto then = rex_case->getThen(i);
1749  result = is_window_function_operator(then) ? then : visit(then);
1750  if (result) {
1751  return result;
1752  }
1753  }
1754  if (rex_case->getElse()) {
1755  auto else_expr = rex_case->getElse();
1756  result = is_window_function_operator(else_expr) ? else_expr : visit(else_expr);
1757  }
1758  return result;
1759  }
size_t branchCount() const
const RexScalar * getWhen(const size_t idx) const
const RexScalar * getThen(const size_t idx) const
virtual const RexScalar * visit(const RexScalar *rex_scalar) const
Definition: RexVisitor.h:27
const RexScalar * getElse() const
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◆ visitOperator()

const RexScalar* anonymous_namespace{RelAlgDagBuilder.cpp}::WindowFunctionDetectionVisitor::visitOperator ( const RexOperator rex_operator) const
inlinefinalprotectedvirtual

Implements RexVisitorBase< const RexScalar * >.

Definition at line 1710 of file RelAlgDagBuilder.cpp.

References anonymous_namespace{RelAlgDagBuilder.cpp}::anonymous_namespace{RelAlgDagBuilder.cpp}::is_window_function_operator().

1710  {
1711  if (is_window_function_operator(rex_operator)) {
1712  return rex_operator;
1713  }
1714 
1715  const size_t operand_count = rex_operator->size();
1716  for (size_t i = 0; i < operand_count; ++i) {
1717  const auto operand = rex_operator->getOperand(i);
1718  if (is_window_function_operator(operand)) {
1719  // Handle both RexWindowFunctionOperators and window functions built up from
1720  // multiple RexScalar objects (e.g. AVG)
1721  return operand;
1722  }
1723  const auto operandResult = visit(operand);
1724  if (operandResult) {
1725  return operandResult;
1726  }
1727  }
1728 
1729  return defaultResult();
1730  }
const RexScalar * getOperand(const size_t idx) const
virtual const RexScalar * visit(const RexScalar *rex_scalar) const
Definition: RexVisitor.h:27
size_t size() const
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The documentation for this class was generated from the following file: