}
@Override
public SchemaPath visitCall(RexCall call) {
logger.debug("RexCall {}, {}", call);
final SqlSyntax syntax = call.getOperator().getSyntax();
switch (syntax) {
case BINARY:
if (call.getKind() == SqlKind.EQUALS) {
dirMatch = false;
// TODO: an assumption here is that the binary predicate is of the form <column> = <value>.