anonymous_namespace{RelAlgDagBuilder.cpp}::WindowFunctionDetectionVisitor Class Reference

Inheritance diagram for anonymous_namespace{RelAlgDagBuilder.cpp}::WindowFunctionDetectionVisitor:

Collaboration diagram for anonymous_namespace{RelAlgDagBuilder.cpp}::WindowFunctionDetectionVisitor:

Protected Member Functions
const RexScalar *	visitOperator (const RexOperator *rex_operator) const final
const RexScalar *	visitCase (const RexCase *rex_case) const final
const RexScalar *	aggregateResult (const RexScalar *const &aggregate, const RexScalar *const &next_result) const final
const RexScalar *	defaultResult () const final
Protected Member Functions inherited from RexVisitor< const RexScalar * >
const RexScalar *	defaultResult () const override

Additional Inherited Members
Public Member Functions inherited from RexVisitor< const RexScalar * >
const RexScalar *	visitInput (const RexInput *) const override
const RexScalar *	visitLiteral (const RexLiteral *) const override
const RexScalar *	visitSubQuery (const RexSubQuery *) const override
const RexScalar *	visitRef (const RexRef *) const override
const RexScalar *	visitOperator (const RexOperator *rex_operator) const override
const RexScalar *	visitCase (const RexCase *rex_case) const override
Public Member Functions inherited from RexVisitorBase< const RexScalar * >
virtual const RexScalar *	visit (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 1713 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 1767 of file RelAlgDagBuilder.cpp.

References UNREACHABLE.

                                                                                    {
    // all methods calling aggregate result should be overriden
    UNREACHABLE();
    return nullptr;
  }

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

inlinefinalprotectedvirtual

Implements RexVisitorBase< const RexScalar * >.

Definition at line 1774 of file RelAlgDagBuilder.cpp.

{ return nullptr; }

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

inlinefinalprotectedvirtual

Implements RexVisitorBase< const RexScalar * >.

Definition at line 1742 of file RelAlgDagBuilder.cpp.

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

                                                                  {
    if (is_window_function_operator(rex_case)) {
      return rex_case;
    }

    auto result = defaultResult();
    for (size_t i = 0; i < rex_case->branchCount(); ++i) {
      const auto when = rex_case->getWhen(i);
      result = is_window_function_operator(when) ? when : visit(when);
      if (result) {
        return result;
      }
      const auto then = rex_case->getThen(i);
      result = is_window_function_operator(then) ? then : visit(then);
      if (result) {
        return result;
      }
    }
    if (rex_case->getElse()) {
      auto else_expr = rex_case->getElse();
      result = is_window_function_operator(else_expr) ? else_expr : visit(else_expr);
    }
    return result;
  }

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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 1716 of file RelAlgDagBuilder.cpp.

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

                                                                              {
    if (is_window_function_operator(rex_operator)) {
      return rex_operator;
    }

    const size_t operand_count = rex_operator->size();
    for (size_t i = 0; i < operand_count; ++i) {
      const auto operand = rex_operator->getOperand(i);
      if (is_window_function_operator(operand)) {
        // Handle both RexWindowFunctionOperators and window functions built up from
        // multiple RexScalar objects (e.g. AVG)
        return operand;
      }
      const auto operandResult = visit(operand);
      if (operandResult) {
        return operandResult;
      }
    }

    return defaultResult();
  }

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

• /home/jenkins-slave/workspace/core-os-doxygen/QueryEngine/RelAlgDagBuilder.cpp