Takeshi Yamamuro created SPARK-29977:
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             Summary: Remove 
newMutableProjection/newOrdering/newNaturalAscendingOrdering  from SparkPlan
                 Key: SPARK-29977
                 URL: https://issues.apache.org/jira/browse/SPARK-29977
             Project: Spark
          Issue Type: Improvement
          Components: SQL
    Affects Versions: 3.0.0
            Reporter: Takeshi Yamamuro


This is to refactor {{SparkPlan}} code; it mainly intends to remove 
{{newMutableProjection}}/{{newOrdering}}/{{newNaturalAscendingOrdering}} from 
{{SparkPlan}}.
The other modifications are listed below;
 * Move {{BaseOrdering}} from 
{{o.a.s.sqlcatalyst.expressions.codegen.GenerateOrdering.scala}} to 
{{o.a.s.sqlcatalyst.expressions.ordering.scala}}
 * {{RowOrdering}} extends {{CodeGeneratorWithInterpretedFallback }}for 
{{BaseOrdering}}
 * Remove the unused variables ({{subexpressionEliminationEnabled}} and 
{{codeGenFallBack}}) from {{SparkPlan}}



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