Question

我是Impala的新手-当我们如下联接两个表时，我们收到以下错误消息。 Impala不支持相关子查询的> = -关于如何实现的任何建议

CREATE TABLE database.test_dve (
  campo1 INT,
  campo2 TIMESTAMP,
  campo3 INT
)
STORED AS PARQUET;

insert into database.test_dve values(1,'2019-09-30',1);
insert into database.test_dve values(2,'2019-09-30',1);
insert into database.test_dve values(3,'2019-09-30',1);

CREATE TABLE database.test_dve2 (
  campo1 INT,
  campo2 TIMESTAMP
)
STORED AS PARQUET;

insert into database.test_dve2 values(1,'2019-10-30');

select *
from database.test_dve a
WHERE 0 >= (SELECT count(*) FROM database.test_dve2 b
WHERE a.campo1 = b.campo1
AND CAST(from_timestamp(a.campo2, 'yyyyMM') as INT) >= CAST(from_timestamp(b.campo2, 'yyyyMM') as INT)
);

错误消息

[HY000] [Cloudera] [ImpalaODBC]（110）在Impala中执行查询时出错：[HY000]：AnalysisException：具有不等于相关谓词的不受支持的聚合子查询：CAST（from_timestamp（a.campo2，'yyyyMM' ）AS INT）> = CAST（from_timestamp（b.campo2，'yyyyMM'）AS INT）

谢谢

Answer 1

尝试将其替换为not exists：

select *
from database.test_dve a
WHERE NOT EXISTS (SELECT 1
                  FROM database.test_dve2 b
                  WHERE a.campo1 = b.campo1 AND
                        CAST(from_timestamp(a.campo2, 'yyyyMM') as INT) >= CAST(from_timestamp(b.campo2, 'yyyyMM') as INT)
                 );

具有不等式相关谓词的不受支持的聚合子查询

1 个答案: