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anonymous_namespace{RelAlgAbstractInterpreter.cpp}::RexWindowFuncReplacementVisitor Class Reference
+ Inheritance diagram for anonymous_namespace{RelAlgAbstractInterpreter.cpp}::RexWindowFuncReplacementVisitor:
+ Collaboration diagram for anonymous_namespace{RelAlgAbstractInterpreter.cpp}::RexWindowFuncReplacementVisitor:

Public Member Functions

 RexWindowFuncReplacementVisitor (std::unique_ptr< const RexScalar > replacement_rex)
 
 ~RexWindowFuncReplacementVisitor ()
 
- Public Member Functions inherited from RexVisitorBase< std::unique_ptr< const RexScalar > >
virtual std::unique_ptr< const
RexScalar
visit (const RexScalar *rex_scalar) const
 

Protected Member Functions

RetType visitOperator (const RexOperator *rex_operator) const final
 
RetType visitCase (const RexCase *rex_case) const final
 
- Protected Member Functions inherited from RexDeepCopyVisitor
RetType visitInput (const RexInput *input) const override
 
RetType visitLiteral (const RexLiteral *literal) const override
 
RetType visitSubQuery (const RexSubQuery *subquery) const override
 
RetType visitRef (const RexRef *ref) const override
 
RetType visitOperator (const RexOperator *rex_operator) const override
 
RetType visitWindowFunctionOperator (const RexWindowFunctionOperator *rex_window_function_operator) const
 
RetType visitCase (const RexCase *rex_case) const override
 

Private Member Functions

bool should_replace_operand (const RexScalar *rex) const
 

Private Attributes

std::unique_ptr< const RexScalarreplacement_rex_
 

Additional Inherited Members

- Protected Types inherited from RexDeepCopyVisitor
using RetType = std::unique_ptr< const RexScalar >
 

Detailed Description

Replaces the first occurrence of a WindowFunctionOperator rex with the provided replacement_rex. Typically used for splitting a complex rex into two simpler rexes, and forwarding one of the rexes to a later node. The forwarded rex is then replaced with a RexInput using this visitor. Note that for window function replacement, the overloads in this visitor must match the overloads in the detection visitor above, to ensure a detected window function expression is properly replaced.

Definition at line 1469 of file RelAlgAbstractInterpreter.cpp.

Constructor & Destructor Documentation

anonymous_namespace{RelAlgAbstractInterpreter.cpp}::RexWindowFuncReplacementVisitor::RexWindowFuncReplacementVisitor ( std::unique_ptr< const RexScalar replacement_rex)
inline

Definition at line 1471 of file RelAlgAbstractInterpreter.cpp.

1472  : replacement_rex_(std::move(replacement_rex)) {}
anonymous_namespace{RelAlgAbstractInterpreter.cpp}::RexWindowFuncReplacementVisitor::~RexWindowFuncReplacementVisitor ( )
inline

Definition at line 1474 of file RelAlgAbstractInterpreter.cpp.

References CHECK.

1474 { CHECK(replacement_rex_ == nullptr); }
#define CHECK(condition)
Definition: Logger.h:187

Member Function Documentation

bool anonymous_namespace{RelAlgAbstractInterpreter.cpp}::RexWindowFuncReplacementVisitor::should_replace_operand ( const RexScalar rex) const
inlineprivate

Definition at line 1524 of file RelAlgAbstractInterpreter.cpp.

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

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RetType anonymous_namespace{RelAlgAbstractInterpreter.cpp}::RexWindowFuncReplacementVisitor::visitCase ( const RexCase rex_case) const
inlinefinalprotectedvirtual

Implements RexVisitorBase< std::unique_ptr< const RexScalar > >.

Definition at line 1502 of file RelAlgAbstractInterpreter.cpp.

References RexCase::branchCount(), RexCase::getElse(), RexCase::getThen(), and RexCase::getWhen().

1502  {
1503  if (should_replace_operand(rex_case)) {
1504  return std::move(replacement_rex_);
1505  }
1506 
1507  std::vector<std::pair<RetType, RetType>> new_pair_list;
1508  for (size_t i = 0; i < rex_case->branchCount(); ++i) {
1509  auto when_operand = rex_case->getWhen(i);
1510  auto then_operand = rex_case->getThen(i);
1511  new_pair_list.emplace_back(
1512  should_replace_operand(when_operand) ? std::move(replacement_rex_)
1513  : visit(when_operand),
1514  should_replace_operand(then_operand) ? std::move(replacement_rex_)
1515  : visit(then_operand));
1516  }
1517  auto new_else = should_replace_operand(rex_case->getElse())
1518  ? std::move(replacement_rex_)
1519  : visit(rex_case->getElse());
1520  return std::make_unique<RexCase>(new_pair_list, new_else);
1521  }
const RexScalar * getThen(const size_t idx) const
const RexScalar * getElse() const
const RexScalar * getWhen(const size_t idx) const
virtual std::unique_ptr< const RexScalar > visit(const RexScalar *rex_scalar) const
Definition: RexVisitor.h:27
size_t branchCount() const

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RetType anonymous_namespace{RelAlgAbstractInterpreter.cpp}::RexWindowFuncReplacementVisitor::visitOperator ( const RexOperator rex_operator) const
inlinefinalprotectedvirtual

Implements RexVisitorBase< std::unique_ptr< const RexScalar > >.

Definition at line 1477 of file RelAlgAbstractInterpreter.cpp.

1477  {
1478  if (should_replace_operand(rex_operator)) {
1479  return std::move(replacement_rex_);
1480  }
1481 
1482  const auto rex_window_function_operator =
1483  dynamic_cast<const RexWindowFunctionOperator*>(rex_operator);
1484  if (rex_window_function_operator) {
1485  // Deep copy the embedded window function operator
1486  return visitWindowFunctionOperator(rex_window_function_operator);
1487  }
1488 
1489  const size_t operand_count = rex_operator->size();
1490  std::vector<RetType> new_opnds;
1491  for (size_t i = 0; i < operand_count; ++i) {
1492  const auto operand = rex_operator->getOperand(i);
1493  if (should_replace_operand(operand)) {
1494  new_opnds.push_back(std::move(replacement_rex_));
1495  } else {
1496  new_opnds.emplace_back(visit(rex_operator->getOperand(i)));
1497  }
1498  }
1499  return rex_operator->getDisambiguated(new_opnds);
1500  }
size_t size() const
const RexScalar * getOperand(const size_t idx) const
RetType visitWindowFunctionOperator(const RexWindowFunctionOperator *rex_window_function_operator) const
Definition: RexVisitor.h:167
virtual std::unique_ptr< const RexOperator > getDisambiguated(std::vector< std::unique_ptr< const RexScalar >> &operands) const
virtual std::unique_ptr< const RexScalar > visit(const RexScalar *rex_scalar) const
Definition: RexVisitor.h:27

Member Data Documentation

std::unique_ptr<const RexScalar> anonymous_namespace{RelAlgAbstractInterpreter.cpp}::RexWindowFuncReplacementVisitor::replacement_rex_
mutableprivate

Definition at line 1528 of file RelAlgAbstractInterpreter.cpp.


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