解析with......insert overwrite......类sql问题 #4933
Description
使用visitor遍历sql的SQLExprTableSource，发现vistitor在遍历类似 wtih......insert overwrite......这种类型的sql时，不会遍历with里的表，而with......select 则不会出现这种情况。
visitor定义如下：
public static class TableVisitor extends OdpsASTVisitorAdapter {
public List<String> tableList = new ArrayList<>();
@Override
public boolean visit(SQLExprTableSource tableSource) {
tableList.add(tableSource.getTableName());
return true;
}
}
遍历代码如下：
String sql1 = "with \n" +
" a as (select * from src where key is not null),\n" +
" b as (select * from src2 where value>0),\n" +
" c as (select * from src3 where value>0),\n" +
" d as (select a.key,b.value from a join b on a.key=b.key ),\n" +
" e as (select a.key,c.value from a left outer join c on a.key=c.key and c.key is not null )\n" +
" insert overwrite table x select * from y;";
SQLStatement statement = SQLUtils.parseSingleStatement(sql1, DbType.odps, false);
TableVisitor visitor = new TableVisitor();
statement.accept(visitor);
System.out.println(visitor.tableList.toString());
打印结果：
[x, y]