docs: private boolean isCond(SQLBinaryOpExpr expr) {
          SQLExpr leftSide = expr.getLeft();
          if (leftSide instanceof SQLMethodInvokeExpr) {
              return isAllowedMethodOnConditionLeft((SQLMethodInvokeExpr) leftSide, expr.getOperator());
          }
          return leftSide instanceof SQLIdentifierExpr ||
                  leftSide instanceof SQLPropertyExpr ||
                  leftSide instanceof SQLVariantRefExpr ||
                  leftSide instanceof SQLCastExpr;
      }