[ https://issues.apache.org/jira/browse/HIVE-16907?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16999775#comment-16999775 ]
Zoltan Haindrich commented on HIVE-16907:
-----------------------------------------
There are a few cases in which this seems like a regression; to make life easier - there is an SA hook which could be used to fix incorrectly written `db.table` references
the hook transparently rewrites `db.table` references as if they were `db`.`table`.
https://github.com/kgyrtkirk/tablename_fixer_hook
This hook could give more transition time to fix the actual queries.
> "INSERT INTO" overwrite old data when destination table encapsulated by backquote
> ------------------------------------------------------------------------------------
>
> Key: HIVE-16907
> URL: https://issues.apache.org/jira/browse/HIVE-16907
> Project: Hive
> Issue Type: Bug
> Components: Parser
> Affects Versions: 1.1.0, 2.1.1
> Reporter: Nemon Lou
> Assignee: Zoltan Haindrich
> Priority: Major
> Fix For: 4.0.0
>
> Attachments: HIVE-16907.02.patch, HIVE-16907.03.patch, HIVE-16907.03.patch, HIVE-16907.03.patch, HIVE-16907.03.patch, HIVE-16907.1.patch
>
>
> A way to reproduce:
> {noformat}
> create database tdb;
> use tdb;
> create table t1(id int);
> create table t2(id int);
> explain insert into `tdb.t1` select * from t2;
> {noformat}
> {noformat}
> +---------------------------------------------------------------------------------------------------------------------------------------------------+
> | Explain |
> +---------------------------------------------------------------------------------------------------------------------------------------------------+
> | STAGE DEPENDENCIES: |
> | Stage-1 is a root stage |
> | Stage-6 depends on stages: Stage-1 , consists of Stage-3, Stage-2, Stage-4 |
> | Stage-3 |
> | Stage-0 depends on stages: Stage-3, Stage-2, Stage-5 |
> | Stage-2 |
> | Stage-4 |
> | Stage-5 depends on stages: Stage-4 |
> | |
> | STAGE PLANS: |
> | Stage: Stage-1 |
> | Map Reduce |
> | Map Operator Tree: |
> | TableScan |
> | alias: t2 |
> | Statistics: Num rows: 0 Data size: 0 Basic stats: NONE Column stats: NONE |
> | Select Operator |
> | expressions: id (type: int) |
> | outputColumnNames: _col0 |
> | Statistics: Num rows: 0 Data size: 0 Basic stats: NONE Column stats: NONE |
> | File Output Operator |
> | compressed: false |
> | Statistics: Num rows: 0 Data size: 0 Basic stats: NONE Column stats: NONE |
> | table: |
> | input format: org.apache.hadoop.hive.ql.io.RCFileInputFormat |
> | output format: org.apache.hadoop.hive.ql.io.RCFileOutputFormat |
> | serde: org.apache.hadoop.hive.serde2.columnar.ColumnarSerDe |
> | name: tdb.t1 |
> | |
> | Stage: Stage-6 |
> | Conditional Operator |
> | |
> | Stage: Stage-3 |
> | Move Operator |
> | files: |
> | hdfs directory: true |
> | destination: hdfs://hacluster/user/hive/warehouse/tdb.db/t1/.hive-staging_hive_2017-06-15_15-52-34_017_849305017872068583-1/-ext-10000 |
> | |
> | Stage: Stage-0 |
> | Move Operator |
> | tables: |
> | replace: true |
> | table: |
> | input format: org.apache.hadoop.hive.ql.io.RCFileInputFormat |
> | output format: org.apache.hadoop.hive.ql.io.RCFileOutputFormat |
> | serde: org.apache.hadoop.hive.serde2.columnar.ColumnarSerDe |
> | name: tdb.t1 |
> | |
> | Stage: Stage-2 |
> | Merge File Operator |
> | Map Operator Tree: |
> | RCFile Merge Operator |
> | merge level: block |
> | input format: org.apache.hadoop.hive.ql.io.RCFileInputFormat |
> | |
> | Stage: Stage-4 |
> | Merge File Operator |
> | Map Operator Tree: |
> | RCFile Merge Operator |
> | merge level: block |
> | input format: org.apache.hadoop.hive.ql.io.RCFileInputFormat |
> | |
> | Stage: Stage-5 |
> | Move Operator |
> | files: |
> | hdfs directory: true |
> | destination: hdfs://hacluster/user/hive/warehouse/tdb.db/t1/.hive-staging_hive_2017-06-15_15-52-34_017_849305017872068583-1/-ext-10000 |
> | |
> +---------------------------------------------------------------------------------------------------------------------------------------------------+
> {noformat}
> Note that 'replace: true' in move operator
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