hive sql 常見異常

一、union

Logging initialized using configuration in file:/home/xiaoju/hadoop/apache-hive-1.2.1-bin/conf/hive-log4j.properties
Added [target/publiclog-serde-1.0-SNAPSHOT-jar-with-dependencies.jar] to class path
Added resources: [target/publiclog-serde-1.0-SNAPSHOT-jar-with-dependencies.jar]
FAILED: SemanticException Schema of both sides of union should match.

緣由：union 兩邊的表必須字段必須一致。

二、insert into 

17/02/22 20:15:54 WARN conf.HiveConf: HiveConf of name hive.client.unlimit.users does not exist
17/02/22 20:15:54 WARN conf.HiveConf: HiveConf of name hive.hadoop.master does not exist

Logging initialized using configuration in file:/home/xiaoju/hadoop/apache-hive-1.2.1-bin/conf/hive-log4j.properties
Added [target/publiclog-serde-1.0-SNAPSHOT-jar-with-dependencies.jar] to class path
Added resources: [target/publiclog-serde-1.0-SNAPSHOT-jar-with-dependencies.jar]
OK
Time taken: 0.859 seconds
OK
Time taken: 0.291 seconds
FAILED: SemanticException [Error 10044]: Line 3:18 Cannot insert into target table because column number/types are different ''20'': Table insclause-0 has 1 columns, but query has 2 columns.

緣由：insert into 後跟的結果集的字段類型和個數與表的字段和個數不一致。