org.apache.drill.exec.planner.index

Class PathInExpr

java.lang.Object

org.apache.drill.common.expression.visitors.AbstractExprVisitor<Boolean,Void,RuntimeException>

org.apache.drill.exec.planner.index.PathInExpr

All Implemented Interfaces:

ExprVisitor<Boolean,Void,RuntimeException>

public class PathInExpr
extends AbstractExprVisitor<Boolean,Void,RuntimeException>

Class PathInExpr is to recursively analyze a expression trees with a map of indexed expression collected from indexDescriptor, e.g. Map 'cast(a.q as int)' -> '$0' means the expression 'cast(a.q as int)' is named as '$0' in index table.

for project expressions: cast(a.q as int), a.q, b + c, PathInExpr will get remainderPath {a.q, b, c}, which is helpful to determine if q query is covering. remainderPathsInFunction will be {a.q}, which will be used to decide if the {a.q} in scan column and project rowtype should be removed or not.

This class could be more generic to support any expression, for now it works for only 'cast(schemapath as type)'.

Constructor Summary

Constructors

Constructor and Description
PathInExpr(Map<LogicalExpression,Set<SchemaPath>> pathsInExpr)

Method Summary

Modifier and Type	Method and Description
Set<LogicalExpression>	getRemainderPaths()
Set<LogicalExpression>	getRemainderPathsInFunctions()
Boolean	visitCastExpression(CastExpression castExpr, Void value)
Boolean	visitFunctionCall(FunctionCall call, Void value)
Boolean	visitFunctionHolderExpression(FunctionHolderExpression holder, Void value)
Boolean	visitIfExpression(IfExpression ifExpr, Void value)
Boolean	visitSchemaPath(SchemaPath path, Void value)
Boolean	visitUnknown(LogicalExpression e, Void value) Handles implementation-specific expressions not known to the visitor structure.

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

visitAnyValueExpression, visitBooleanConstant, visitBooleanOperator, visitConvertExpression, visitDateConstant, visitDecimal18Constant, visitDecimal28Constant, visitDecimal38Constant, visitDecimal9Constant, visitDoubleConstant, visitFloatConstant, visitIntConstant, visitIntervalDayConstant, visitIntervalYearConstant, visitLongConstant, visitNullConstant, visitNullExpression, visitParameter, visitQuotedStringConstant, visitTimeConstant, visitTimeStampConstant, visitTypedFieldExpr, visitVarDecimalConstant

Methods inherited from class java.lang.Object

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

Constructor Detail

PathInExpr

public PathInExpr(Map<LogicalExpression,Set<SchemaPath>> pathsInExpr)

Method Detail

getRemainderPaths

public Set<LogicalExpression> getRemainderPaths()

getRemainderPathsInFunctions

public Set<LogicalExpression> getRemainderPathsInFunctions()

visitFunctionCall

public Boolean visitFunctionCall(FunctionCall call,
                                 Void value)
                          throws RuntimeException

Specified by:

visitFunctionCall in interface ExprVisitor<Boolean,Void,RuntimeException>

Overrides:

visitFunctionCall in class AbstractExprVisitor<Boolean,Void,RuntimeException>

Throws:

RuntimeException

visitFunctionHolderExpression

public Boolean visitFunctionHolderExpression(FunctionHolderExpression holder,
                                             Void value)
                                      throws RuntimeException

Specified by:

visitFunctionHolderExpression in interface ExprVisitor<Boolean,Void,RuntimeException>

Overrides:

visitFunctionHolderExpression in class AbstractExprVisitor<Boolean,Void,RuntimeException>

Throws:

RuntimeException

visitCastExpression

public Boolean visitCastExpression(CastExpression castExpr,
                                   Void value)
                            throws RuntimeException

Specified by:

visitCastExpression in interface ExprVisitor<Boolean,Void,RuntimeException>

Overrides:

visitCastExpression in class AbstractExprVisitor<Boolean,Void,RuntimeException>

Throws:

RuntimeException

visitIfExpression

public Boolean visitIfExpression(IfExpression ifExpr,
                                 Void value)
                          throws RuntimeException

Specified by:

visitIfExpression in interface ExprVisitor<Boolean,Void,RuntimeException>

Overrides:

visitIfExpression in class AbstractExprVisitor<Boolean,Void,RuntimeException>

Throws:

RuntimeException

visitSchemaPath

public Boolean visitSchemaPath(SchemaPath path,
                               Void value)
                        throws RuntimeException

Specified by:

visitSchemaPath in interface ExprVisitor<Boolean,Void,RuntimeException>

Overrides:

visitSchemaPath in class AbstractExprVisitor<Boolean,Void,RuntimeException>

Throws:

RuntimeException

visitUnknown

public Boolean visitUnknown(LogicalExpression e,
                            Void value)
                     throws RuntimeException

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<Boolean,Void,RuntimeException>

Overrides:

visitUnknown in class AbstractExprVisitor<Boolean,Void,RuntimeException>

Throws:

RuntimeException