docs: public static AbstractExpression getOtherTableExpression(
              AbstractExpression expr, String tableAlias) {
          assert(expr != null);
          AbstractExpression retval = expr.getLeft();
          if (isOperandDependentOnTable(retval, tableAlias)) {
              retval = expr.getRight();
              assert( ! isOperandDependentOnTable(retval, tableAlias));
          }
          return retval;
      }