/** Analyzes a GROUPING SETS item in a GROUP BY clause. */
private static void convertGroupSet(
SqlValidatorScope scope,
List<SqlNode> groupExprs,
Map<Integer, Integer> groupExprProjection,
ImmutableList.Builder<ImmutableBitSet> builder,
SqlNode groupExpr) {
switch (groupExpr.getKind()) {
case GROUPING_SETS:
final SqlCall call = (SqlCall) groupExpr;
for (SqlNode node : call.getOperandList()) {
convertGroupSet(scope, groupExprs, groupExprProjection, builder, node);
}
return;
case ROW:
final List<ImmutableBitSet> bitSets =
analyzeGroupTuple(
scope, groupExprs, groupExprProjection, ((SqlCall) groupExpr).getOperandList());
builder.add(ImmutableBitSet.union(bitSets));
return;
default:
builder.add(analyzeGroupExpr(scope, groupExprs, groupExprProjection, groupExpr));
return;
}
}
// Override to copy all arguments regardless of whether visitor changes
// them.
protected SqlNode visitScoped(SqlCall call) {
ArgHandler<SqlNode> argHandler = new CallCopyingArgHandler(call, true);
call.getOperator().acceptCall(this, call, false, argHandler);
return argHandler.result();
}