org.apache.drill.exec.physical.impl.project

Class OutputWidthVisitor

java.lang.Object

org.apache.drill.common.expression.visitors.AbstractExprVisitor<T,VAL,EXCEP>

org.apache.drill.exec.expr.AbstractExecExprVisitor<OutputWidthExpression,OutputWidthVisitorState,RuntimeException>

org.apache.drill.exec.physical.impl.project.OutputWidthVisitor

All Implemented Interfaces:

ExprVisitor<OutputWidthExpression,OutputWidthVisitorState,RuntimeException>

public class OutputWidthVisitor
extends AbstractExecExprVisitor<OutputWidthExpression,OutputWidthVisitorState,RuntimeException>

Constructor Summary

Constructors

Constructor and Description
OutputWidthVisitor()

Method Summary

Modifier and Type	Method and Description
OutputWidthExpression	visitFixedLenExpr(OutputWidthExpression.FixedLenExpr fixedLenExpr, OutputWidthVisitorState state)
OutputWidthExpression	visitFunctionCallExpr(OutputWidthExpression.FunctionCallExpr functionCallExpr, OutputWidthVisitorState state) Converts a OutputWidthExpression.FunctionCallExpr to a OutputWidthExpression.FixedLenExpr by passing the the args of the function to the width calculator for this function.
OutputWidthExpression	visitFunctionHolderExpression(FunctionHolderExpression holderExpr, OutputWidthVisitorState state) Handles a FunctionHolderExpression.
OutputWidthExpression	visitIfElseWidthExpr(OutputWidthExpression.IfElseWidthExpr ifElseWidthExpr, OutputWidthVisitorState state) Converts the OutputWidthExpression.IfElseWidthExpr to a OutputWidthExpression.FixedLenExpr by taking the max of the if-expr-width and the else-expr-width.
OutputWidthExpression	visitIfExpression(IfExpression ifExpression, OutputWidthVisitorState state) Records the IfExpression as a OutputWidthExpression.IfElseWidthExpr.
OutputWidthExpression	visitNullConstant(TypedNullConstant nullConstant, OutputWidthVisitorState state)
OutputWidthExpression	visitQuotedStringConstant(ValueExpressions.QuotedString quotedString, OutputWidthVisitorState state)
OutputWidthExpression	visitUnknown(LogicalExpression logicalExpression, OutputWidthVisitorState state) Handles implementation-specific expressions not known to the visitor structure.
OutputWidthExpression	visitValueVectorReadExpression(ValueVectorReadExpression readExpr, OutputWidthVisitorState state) Records a variable width read expression as a OutputWidthExpression.VarLenReadExpr.
OutputWidthExpression	visitValueVectorWriteExpression(ValueVectorWriteExpression writeExpr, OutputWidthVisitorState state) Records a variable width write expression.
OutputWidthExpression	visitVarDecimalConstant(ValueExpressions.VarDecimalExpression varDecimalExpression, OutputWidthVisitorState state)
OutputWidthExpression	visitVarLenReadExpr(OutputWidthExpression.VarLenReadExpr varLenReadExpr, OutputWidthVisitorState state) Converts the OutputWidthExpression.VarLenReadExpr to a OutputWidthExpression.FixedLenExpr by getting the size for the corresponding column from the RecordBatchSizer.

Methods inherited from class org.apache.drill.exec.expr.AbstractExecExprVisitor

visitUnknown

Methods inherited from class org.apache.drill.common.expression.visitors.AbstractExprVisitor

visitAnyValueExpression, visitBooleanConstant, visitBooleanOperator, visitCastExpression, visitConvertExpression, visitDateConstant, visitDecimal18Constant, visitDecimal28Constant, visitDecimal38Constant, visitDecimal9Constant, visitDoubleConstant, visitFloatConstant, visitFunctionCall, visitIntConstant, visitIntervalDayConstant, visitIntervalYearConstant, visitLongConstant, visitNullExpression, visitParameter, visitSchemaPath, visitTimeConstant, visitTimeStampConstant, visitTypedFieldExpr

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

OutputWidthVisitor

public OutputWidthVisitor()

Method Detail

visitVarDecimalConstant

public OutputWidthExpression visitVarDecimalConstant(ValueExpressions.VarDecimalExpression varDecimalExpression,
                                                     OutputWidthVisitorState state)
                                              throws RuntimeException

Specified by:

visitVarDecimalConstant in interface ExprVisitor<OutputWidthExpression,OutputWidthVisitorState,RuntimeException>

Overrides:

visitVarDecimalConstant in class AbstractExprVisitor<OutputWidthExpression,OutputWidthVisitorState,RuntimeException>

Throws:

RuntimeException

visitIfExpression

public OutputWidthExpression visitIfExpression(IfExpression ifExpression,
                                               OutputWidthVisitorState state)
                                        throws RuntimeException

Records the IfExpression as a OutputWidthExpression.IfElseWidthExpr. IfElseWidthExpr will be reduced to a OutputWidthExpression.FixedLenExpr by taking the max of the if-expr-width and the else-expr-width.

Specified by:

visitIfExpression in interface ExprVisitor<OutputWidthExpression,OutputWidthVisitorState,RuntimeException>

Overrides:

visitIfExpression in class AbstractExprVisitor<OutputWidthExpression,OutputWidthVisitorState,RuntimeException>

Throws:

RuntimeException

visitFunctionHolderExpression

public OutputWidthExpression visitFunctionHolderExpression(FunctionHolderExpression holderExpr,
                                                           OutputWidthVisitorState state)
                                                    throws RuntimeException

Handles a FunctionHolderExpression. Functions that produce fixed-width output are trivially converted to a OutputWidthExpression.FixedLenExpr. For functions that produce variable width output, the output width calculator annotation is looked-up and recorded in a OutputWidthExpression.FunctionCallExpr. This calculator will later be used to convert the FunctionCallExpr to a OutputWidthExpression.FixedLenExpr expression

Specified by:

visitFunctionHolderExpression in interface ExprVisitor<OutputWidthExpression,OutputWidthVisitorState,RuntimeException>

Overrides:

visitFunctionHolderExpression in class AbstractExprVisitor<OutputWidthExpression,OutputWidthVisitorState,RuntimeException>

Throws:

RuntimeException

visitValueVectorWriteExpression

public OutputWidthExpression visitValueVectorWriteExpression(ValueVectorWriteExpression writeExpr,
                                                             OutputWidthVisitorState state)
                                                      throws RuntimeException

Records a variable width write expression. This will be converted to a OutputWidthExpression.FixedLenExpr expression by walking the tree of expression attached to the write expression.

Overrides:

visitValueVectorWriteExpression in class AbstractExecExprVisitor<OutputWidthExpression,OutputWidthVisitorState,RuntimeException>

Throws:

RuntimeException

visitValueVectorReadExpression

public OutputWidthExpression visitValueVectorReadExpression(ValueVectorReadExpression readExpr,
                                                            OutputWidthVisitorState state)
                                                     throws RuntimeException

Records a variable width read expression as a OutputWidthExpression.VarLenReadExpr. This will be converted to a OutputWidthExpression.FixedLenExpr expression by getting the size for the corresponding column from the RecordBatchSizer.

Overrides:

visitValueVectorReadExpression in class AbstractExecExprVisitor<OutputWidthExpression,OutputWidthVisitorState,RuntimeException>

Throws:

RuntimeException

visitQuotedStringConstant

public OutputWidthExpression visitQuotedStringConstant(ValueExpressions.QuotedString quotedString,
                                                       OutputWidthVisitorState state)
                                                throws RuntimeException

Specified by:

visitQuotedStringConstant in interface ExprVisitor<OutputWidthExpression,OutputWidthVisitorState,RuntimeException>

Overrides:

visitQuotedStringConstant in class AbstractExprVisitor<OutputWidthExpression,OutputWidthVisitorState,RuntimeException>

Throws:

RuntimeException

visitUnknown

public OutputWidthExpression visitUnknown(LogicalExpression logicalExpression,
                                          OutputWidthVisitorState state)

Description copied from class: AbstractExprVisitor

Handles implementation-specific expressions not known to the visitor structure. Since there are no "visitFoo" methods for these "unknown" expressions, subclassses should use the functionally-equivalent instanceof approach to parse out these "unknown" expressions.

Specified by:

visitUnknown in interface ExprVisitor<OutputWidthExpression,OutputWidthVisitorState,RuntimeException>

Overrides:

visitUnknown in class AbstractExprVisitor<OutputWidthExpression,OutputWidthVisitorState,RuntimeException>

visitNullConstant

public OutputWidthExpression visitNullConstant(TypedNullConstant nullConstant,
                                               OutputWidthVisitorState state)
                                        throws RuntimeException

Specified by:

visitNullConstant in interface ExprVisitor<OutputWidthExpression,OutputWidthVisitorState,RuntimeException>

Overrides:

visitNullConstant in class AbstractExprVisitor<OutputWidthExpression,OutputWidthVisitorState,RuntimeException>

Throws:

RuntimeException

visitFixedLenExpr

public OutputWidthExpression visitFixedLenExpr(OutputWidthExpression.FixedLenExpr fixedLenExpr,
                                               OutputWidthVisitorState state)
                                        throws RuntimeException

Overrides:

visitFixedLenExpr in class AbstractExecExprVisitor<OutputWidthExpression,OutputWidthVisitorState,RuntimeException>

Throws:

RuntimeException

visitVarLenReadExpr

public OutputWidthExpression visitVarLenReadExpr(OutputWidthExpression.VarLenReadExpr varLenReadExpr,
                                                 OutputWidthVisitorState state)
                                          throws RuntimeException

Converts the OutputWidthExpression.VarLenReadExpr to a OutputWidthExpression.FixedLenExpr by getting the size for the corresponding column from the RecordBatchSizer.

Overrides:

visitVarLenReadExpr in class AbstractExecExprVisitor<OutputWidthExpression,OutputWidthVisitorState,RuntimeException>

Throws:

RuntimeException

visitFunctionCallExpr

public OutputWidthExpression visitFunctionCallExpr(OutputWidthExpression.FunctionCallExpr functionCallExpr,
                                                   OutputWidthVisitorState state)
                                            throws RuntimeException

Converts a OutputWidthExpression.FunctionCallExpr to a OutputWidthExpression.FixedLenExpr by passing the the args of the function to the width calculator for this function.

Overrides:

visitFunctionCallExpr in class AbstractExecExprVisitor<OutputWidthExpression,OutputWidthVisitorState,RuntimeException>

Throws:

RuntimeException

visitIfElseWidthExpr

public OutputWidthExpression visitIfElseWidthExpr(OutputWidthExpression.IfElseWidthExpr ifElseWidthExpr,
                                                  OutputWidthVisitorState state)
                                           throws RuntimeException

Converts the OutputWidthExpression.IfElseWidthExpr to a OutputWidthExpression.FixedLenExpr by taking the max of the if-expr-width and the else-expr-width.

Overrides:

visitIfElseWidthExpr in class AbstractExecExprVisitor<OutputWidthExpression,OutputWidthVisitorState,RuntimeException>

Throws:

RuntimeException