Method transform

core/src/main/java/org/apache/calcite/tools/Planner.java:124–124

Converts one relational expression tree into another relational expression based on a particular rule set and requires set of traits. @param ruleSetIndex The RuleSet to use for conversion purposes. Note that this is zero-indexed and is based on the list and order

(int ruleSetIndex,
      RelTraitSet requiredOutputTraits, RelNode rel)

   *     error
   */
  RelNode transform(int ruleSetIndex,
      RelTraitSet requiredOutputTraits, RelNode rel)
      throws RelConversionException;