// implement RelOptRule
public void onMatch(RelOptRuleCall call) {
final FilterRelBase filterRel = call.rel(0);
final ProjectRelBase projRel = call.rel(1);
// convert the filter to one that references the child of the project
RexNode newCondition = RelOptUtil.pushFilterPastProject(filterRel.getCondition(), projRel);
RelNode newFilterRel =
filterFactory == null
? filterRel.copy(filterRel.getTraitSet(), projRel.getChild(), newCondition)
: filterFactory.createFilter(projRel.getChild(), newCondition);
RelNode newProjRel =
projectFactory == null
? projRel.copy(
projRel.getTraitSet(), newFilterRel, projRel.getProjects(), projRel.getRowType())
: projectFactory.createProject(
newFilterRel, projRel.getProjects(), projRel.getRowType().getFieldNames());
call.transformTo(newProjRel);
}
public Boolean areColumnsUnique(FilterRelBase rel, BitSet columns, boolean ignoreNulls) {
return RelMetadataQuery.areColumnsUnique(rel.getChild(), columns, ignoreNulls);
}