AbstractWhereClauseListener.java 文件源码

@Override
public void enterNull_predicate(SQLParser.Null_predicateContext ctx) {
  super.enterNull_predicate(ctx);

  enterNullClause();
  for (int i = 0; i < ctx.getChildCount(); i++) {
    ParseTree child = ctx.getChild(i);
    if (child instanceof TerminalNodeImpl) {
      if (isNot(child.getText())) {
        currentPredicate.negate();
      }
    }
  }
  currentPredicate.nullOperator();
}