ReduceDecimalsRule.PassThroughExpander (Apache Calcite API)

java.lang.Object
- org.apache.calcite.rel.rules.ReduceDecimalsRule.RexExpander
- - org.apache.calcite.rel.rules.ReduceDecimalsRule.PassThroughExpander

Enclosing class:

ReduceDecimalsRule
```
private class ReduceDecimalsRule.PassThroughExpander
extends ReduceDecimalsRule.RexExpander
```
An expander that substitutes decimals with their integer representations. If the output is decimal, the output is reinterpreted from the integer representation into a decimal.

Field Summary
- Fields inherited from class org.apache.calcite.rel.rules.ReduceDecimalsRule.RexExpander
  builder, int8, real8

Constructor Summary

Constructors
Modifier Constructor Description

private PassThroughExpander(RexBuilder builder)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`boolean`	`canExpand(RexCall call)`	This defaults to the utility method, `RexUtil.requiresDecimalExpansion(RexNode, boolean)` which checks general guidelines on whether a rewrite should be considered at all.
`RexNode`	`expand(RexCall call)`	Rewrites an expression containing decimals.

Methods inherited from class org.apache.calcite.rel.rules.ReduceDecimalsRule.RexExpander
accessValue, decodeValue, encodeValue, encodeValue, ensureScale, ensureType, ensureType, makeApproxLiteral, makeApproxScaleFactor, makeCase, makeCase, makeDivide, makeExactLiteral, makeIsNegative, makeIsPositive, makeMinus, makeMultiply, makePlus, makeRoundFactor, makeScaleFactor, powerOfTen, scaleDown, scaleDownDouble, scaleUp

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - PassThroughExpander
```
private PassThroughExpander(RexBuilder builder)
```
- Method Detail
  - canExpand
```
public boolean canExpand(RexCall call)
```
    Description copied from class: ReduceDecimalsRule.RexExpander
    
    This defaults to the utility method, RexUtil.requiresDecimalExpansion(RexNode, boolean) which checks general guidelines on whether a rewrite should be considered at all. In general, it is helpful to update the utility method since that method is often used to filter the somewhat expensive rewrite process.
    However, this method provides another place for implementations of RexExpander to make a more detailed analysis before deciding on whether to perform a rewrite.
    
    Overrides:
    
    canExpand in class ReduceDecimalsRule.RexExpander
  - expand
```
public RexNode expand(RexCall call)
```
    Description copied from class: ReduceDecimalsRule.RexExpander
    
    Rewrites an expression containing decimals. Normally, this method always performs a rewrite, but implementations may choose to return the original expression if no change was required.
    
    Specified by:
    
    expand in class ReduceDecimalsRule.RexExpander