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

- Public Types inherited from RexDeepCopyVisitor
using RowValues = std::vector< std::unique_ptr< const RexScalar >>
- Static Public Member Functions inherited from RexDeepCopyVisitor
static std::vector< RowValuescopy (std::vector< RowValues > const &rhs)
- 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 1785 of file RelAlgDagBuilder.cpp.

Constructor & Destructor Documentation

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

Definition at line 1787 of file RelAlgDagBuilder.cpp.

1788  : replacement_rex_(std::move(replacement_rex)) {}
anonymous_namespace{RelAlgDagBuilder.cpp}::RexWindowFuncReplacementVisitor::~RexWindowFuncReplacementVisitor ( )

Definition at line 1790 of file RelAlgDagBuilder.cpp.

References CHECK.

1790 { CHECK(replacement_rex_ == nullptr); }
#define CHECK(condition)
Definition: Logger.h:197

Member Function Documentation

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

Definition at line 1840 of file RelAlgDagBuilder.cpp.

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

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

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

Definition at line 1818 of file RelAlgDagBuilder.cpp.

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

1818  {
1819  if (should_replace_operand(rex_case)) {
1820  return std::move(replacement_rex_);
1821  }
1823  std::vector<std::pair<RetType, RetType>> new_pair_list;
1824  for (size_t i = 0; i < rex_case->branchCount(); ++i) {
1825  auto when_operand = rex_case->getWhen(i);
1826  auto then_operand = rex_case->getThen(i);
1827  new_pair_list.emplace_back(
1828  should_replace_operand(when_operand) ? std::move(replacement_rex_)
1829  : visit(when_operand),
1830  should_replace_operand(then_operand) ? std::move(replacement_rex_)
1831  : visit(then_operand));
1832  }
1833  auto new_else = should_replace_operand(rex_case->getElse())
1834  ? std::move(replacement_rex_)
1835  : visit(rex_case->getElse());
1836  return std::make_unique<RexCase>(new_pair_list, new_else);
1837  }
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{RelAlgDagBuilder.cpp}::RexWindowFuncReplacementVisitor::visitOperator ( const RexOperator rex_operator) const

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

Definition at line 1793 of file RelAlgDagBuilder.cpp.

References generate_TableFunctionsFactory_init::i.

1793  {
1794  if (should_replace_operand(rex_operator)) {
1795  return std::move(replacement_rex_);
1796  }
1798  const auto rex_window_function_operator =
1799  dynamic_cast<const RexWindowFunctionOperator*>(rex_operator);
1800  if (rex_window_function_operator) {
1801  // Deep copy the embedded window function operator
1802  return visitWindowFunctionOperator(rex_window_function_operator);
1803  }
1805  const size_t operand_count = rex_operator->size();
1806  std::vector<RetType> new_opnds;
1807  for (size_t i = 0; i < operand_count; ++i) {
1808  const auto operand = rex_operator->getOperand(i);
1809  if (should_replace_operand(operand)) {
1810  new_opnds.push_back(std::move(replacement_rex_));
1811  } else {
1812  new_opnds.emplace_back(visit(rex_operator->getOperand(i)));
1813  }
1814  }
1815  return rex_operator->getDisambiguated(new_opnds);
1816  }
size_t size() const
const RexScalar * getOperand(const size_t idx) const
RetType visitWindowFunctionOperator(const RexWindowFunctionOperator *rex_window_function_operator) const
Definition: RexVisitor.h:168
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{RelAlgDagBuilder.cpp}::RexWindowFuncReplacementVisitor::replacement_rex_

Definition at line 1844 of file RelAlgDagBuilder.cpp.

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