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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 1526 of file RelAlgDagBuilder.cpp.

Member Function Documentation

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 1580 of file RelAlgDagBuilder.cpp.

References UNREACHABLE.

1581  {
1582  // all methods calling aggregate result should be overriden
1583  UNREACHABLE();
1584  return nullptr;
1585  }
#define UNREACHABLE()
Definition: Logger.h:241
const RexScalar* anonymous_namespace{RelAlgDagBuilder.cpp}::WindowFunctionDetectionVisitor::defaultResult ( ) const
inlinefinalprotectedvirtual

Implements RexVisitorBase< const RexScalar * >.

Definition at line 1587 of file RelAlgDagBuilder.cpp.

1587 { return nullptr; }
const RexScalar* anonymous_namespace{RelAlgDagBuilder.cpp}::WindowFunctionDetectionVisitor::visitCase ( const RexCase rex_case) const
inlinefinalprotectedvirtual

Implements RexVisitorBase< const RexScalar * >.

Definition at line 1555 of file RelAlgDagBuilder.cpp.

References RexCase::branchCount(), RexCase::getElse(), RexCase::getThen(), RexCase::getWhen(), anonymous_namespace{RelAlgDagBuilder.cpp}::anonymous_namespace{RelAlgDagBuilder.cpp}::is_window_function_operator(), and run_benchmark_import::result.

1555  {
1556  if (is_window_function_operator(rex_case)) {
1557  return rex_case;
1558  }
1559 
1560  auto result = defaultResult();
1561  for (size_t i = 0; i < rex_case->branchCount(); ++i) {
1562  const auto when = rex_case->getWhen(i);
1563  result = is_window_function_operator(when) ? when : visit(when);
1564  if (result) {
1565  return result;
1566  }
1567  const auto then = rex_case->getThen(i);
1568  result = is_window_function_operator(then) ? then : visit(then);
1569  if (result) {
1570  return result;
1571  }
1572  }
1573  if (rex_case->getElse()) {
1574  auto else_expr = rex_case->getElse();
1575  result = is_window_function_operator(else_expr) ? else_expr : visit(else_expr);
1576  }
1577  return result;
1578  }
const RexScalar * getThen(const size_t idx) const
const RexScalar * getElse() const
const RexScalar * getWhen(const size_t idx) const
virtual const RexScalar * visit(const RexScalar *rex_scalar) const
Definition: RexVisitor.h:27
size_t branchCount() const

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

Implements RexVisitorBase< const RexScalar * >.

Definition at line 1529 of file RelAlgDagBuilder.cpp.

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

1529  {
1530  if (is_window_function_operator(rex_operator)) {
1531  return rex_operator;
1532  }
1533 
1534  const size_t operand_count = rex_operator->size();
1535  for (size_t i = 0; i < operand_count; ++i) {
1536  const auto operand = rex_operator->getOperand(i);
1537  if (is_window_function_operator(operand)) {
1538  // Handle both RexWindowFunctionOperators and window functions built up from
1539  // multiple RexScalar objects (e.g. AVG)
1540  return operand;
1541  }
1542  const auto operandResult = visit(operand);
1543  if (operandResult) {
1544  return operandResult;
1545  }
1546  }
1547 
1548  return defaultResult();
1549  }
size_t size() const
const RexScalar * getOperand(const size_t idx) const
virtual const RexScalar * visit(const RexScalar *rex_scalar) const
Definition: RexVisitor.h:27

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The documentation for this class was generated from the following file: