org.apache.drill.exec.planner.index

Class IndexableExprMarker

java.lang.Object

org.apache.calcite.rex.RexVisitorImpl<Boolean>

org.apache.drill.exec.planner.index.IndexableExprMarker

All Implemented Interfaces:

org.apache.calcite.rex.RexVisitor<Boolean>

public class IndexableExprMarker
extends org.apache.calcite.rex.RexVisitorImpl<Boolean>

The filter expressions that could be indexed Other than SchemaPaths, which represent columns of a table and could be indexed, we consider only function expressions, and specifically, CAST function. To judge if an expression is indexable, we check these: 1, this expression should be one operand of a comparison operator, one of SqlKind.COMPARISON: IN, EQUALS, NOT_EQUALS, LESS_THAN, GREATER_THAN, GREATER_THAN_OR_EQUAL, LESS_THAN_OR_EQUAL 2, the expression tree should contain at least one inputRef (which means this expression is a computation on top of at least one column), and if we have more than one indexable expressions are found from operands of comparison operator, we should not take any expression as indexable. 3, (LIMIT to one level function) the expression is a function call, and no nested function call underneath, except ITEM 4, (LIMIT to CAST), the function call is a CAST

Field Summary

Fields inherited from class org.apache.calcite.rex.RexVisitorImpl

deep

Constructor Summary

Constructors

Constructor and Description
IndexableExprMarker(org.apache.calcite.rel.RelNode inputRel)

Method Summary

Modifier and Type	Method and Description
boolean	containInputRef(org.apache.calcite.rex.RexNode rex)
Map<org.apache.calcite.rex.RexNode,LogicalExpression>	getEqualOnCastChar()
Set<LogicalExpression>	getExpressionsOnlyInEquality() return the expressions that were only in equality condition _and_ only once.
Map<org.apache.calcite.rex.RexNode,LogicalExpression>	getIndexableExpression()
boolean	operandsAreIndexable(org.apache.calcite.rex.RexCall call)
Boolean	visitCall(org.apache.calcite.rex.RexCall call)
Boolean	visitCorrelVariable(org.apache.calcite.rex.RexCorrelVariable correlVariable)
Boolean	visitDynamicParam(org.apache.calcite.rex.RexDynamicParam dynamicParam)
Boolean	visitFieldAccess(org.apache.calcite.rex.RexFieldAccess fieldAccess)
Boolean	visitInputRef(org.apache.calcite.rex.RexInputRef rexInputRef)
Boolean	visitLiteral(org.apache.calcite.rex.RexLiteral literal)
Boolean	visitLocalRef(org.apache.calcite.rex.RexLocalRef localRef)
Boolean	visitOver(org.apache.calcite.rex.RexOver over)
Boolean	visitRangeRef(org.apache.calcite.rex.RexRangeRef rangeRef)

Methods inherited from class org.apache.calcite.rex.RexVisitorImpl

visitArrayAnd, visitArrayOr, visitPatternFieldRef, visitSubQuery, visitTableInputRef

Methods inherited from class java.lang.Object

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

Constructor Detail

IndexableExprMarker

public IndexableExprMarker(org.apache.calcite.rel.RelNode inputRel)

Method Detail

getIndexableExpression

public Map<org.apache.calcite.rex.RexNode,LogicalExpression> getIndexableExpression()

getEqualOnCastChar

public Map<org.apache.calcite.rex.RexNode,LogicalExpression> getEqualOnCastChar()

getExpressionsOnlyInEquality

public Set<LogicalExpression> getExpressionsOnlyInEquality()

return the expressions that were only in equality condition _and_ only once. ( a.b = 'value' )

Returns:

visitInputRef

public Boolean visitInputRef(org.apache.calcite.rex.RexInputRef rexInputRef)

Specified by:

visitInputRef in interface org.apache.calcite.rex.RexVisitor<Boolean>

Overrides:

visitInputRef in class org.apache.calcite.rex.RexVisitorImpl<Boolean>

containInputRef

public boolean containInputRef(org.apache.calcite.rex.RexNode rex)

operandsAreIndexable

public boolean operandsAreIndexable(org.apache.calcite.rex.RexCall call)

visitCall

public Boolean visitCall(org.apache.calcite.rex.RexCall call)

Specified by:

visitCall in interface org.apache.calcite.rex.RexVisitor<Boolean>

Overrides:

visitCall in class org.apache.calcite.rex.RexVisitorImpl<Boolean>

visitLocalRef

public Boolean visitLocalRef(org.apache.calcite.rex.RexLocalRef localRef)

Specified by:

visitLocalRef in interface org.apache.calcite.rex.RexVisitor<Boolean>

Overrides:

visitLocalRef in class org.apache.calcite.rex.RexVisitorImpl<Boolean>

visitLiteral

public Boolean visitLiteral(org.apache.calcite.rex.RexLiteral literal)

Specified by:

visitLiteral in interface org.apache.calcite.rex.RexVisitor<Boolean>

Overrides:

visitLiteral in class org.apache.calcite.rex.RexVisitorImpl<Boolean>

visitOver

public Boolean visitOver(org.apache.calcite.rex.RexOver over)

Specified by:

visitOver in interface org.apache.calcite.rex.RexVisitor<Boolean>

Overrides:

visitOver in class org.apache.calcite.rex.RexVisitorImpl<Boolean>

visitCorrelVariable

public Boolean visitCorrelVariable(org.apache.calcite.rex.RexCorrelVariable correlVariable)

Specified by:

visitCorrelVariable in interface org.apache.calcite.rex.RexVisitor<Boolean>

Overrides:

visitCorrelVariable in class org.apache.calcite.rex.RexVisitorImpl<Boolean>

visitDynamicParam

public Boolean visitDynamicParam(org.apache.calcite.rex.RexDynamicParam dynamicParam)

Specified by:

visitDynamicParam in interface org.apache.calcite.rex.RexVisitor<Boolean>

Overrides:

visitDynamicParam in class org.apache.calcite.rex.RexVisitorImpl<Boolean>

visitRangeRef

public Boolean visitRangeRef(org.apache.calcite.rex.RexRangeRef rangeRef)

Specified by:

visitRangeRef in interface org.apache.calcite.rex.RexVisitor<Boolean>

Overrides:

visitRangeRef in class org.apache.calcite.rex.RexVisitorImpl<Boolean>

visitFieldAccess

public Boolean visitFieldAccess(org.apache.calcite.rex.RexFieldAccess fieldAccess)

Specified by:

visitFieldAccess in interface org.apache.calcite.rex.RexVisitor<Boolean>

Overrides:

visitFieldAccess in class org.apache.calcite.rex.RexVisitorImpl<Boolean>