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This is an automatically generated e-mail. To reply, visit:
https://reviews.apache.org/r/24289/
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Review request for hive.
Repository: hive-git
Description
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This patch provides ability to update certain stats without scanning any data
or without "hacking the backend db". It helps (esp for CBO work) to set up unit
tests quickly and verify both cbo and the stats subsystem. It also helps when
experimenting with the system if you're just trying out hive/hadoop on a small
cluster. Finally it gives you a quick and clean way to fix things when
something went wrong wrt stats in your environment.
Usage:
ALTER TABLE table_name PARTITION partition_spec UPDATE STATISTICS FOR COLUMN
col_name SET col_statistics
For example,
ALTER TABLE src_x_int UPDATE STATISTICS FOR COLUMN key SET
('numDVs'='101','highValue'='10001.0');
ALTER TABLE src_p PARTITION(partitionId=1) UPDATE STATISTICS FOR COLUMN key SET
('numDVs'='100','avgColLen'='1.0001');
Diffs
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cli/src/java/org/apache/hadoop/hive/cli/CliDriver.java 3cdedba
metastore/bin/.gitignore 0dd9890
metastore/src/java/org/apache/hadoop/hive/metastore/HiveMetaStoreClient.java
4c9a597
metastore/src/java/org/apache/hadoop/hive/metastore/StatObjectConverter.java
c3e2820
metastore/src/model/org/apache/hadoop/hive/metastore/model/MPartitionColumnStatistics.java
89c31dc
metastore/src/model/org/apache/hadoop/hive/metastore/model/MTableColumnStatistics.java
44bbab5
ql/.gitignore 916e17c
ql/src/java/org/apache/hadoop/hive/ql/exec/ColumnStatsUpdateTask.java
PRE-CREATION
ql/src/java/org/apache/hadoop/hive/ql/exec/TaskFactory.java 24dfed1
ql/src/java/org/apache/hadoop/hive/ql/exec/mr/MapRedTask.java e83bc17
ql/src/java/org/apache/hadoop/hive/ql/metadata/SessionHiveMetaStoreClient.java
4300145
ql/src/java/org/apache/hadoop/hive/ql/parse/DDLSemanticAnalyzer.java 67a3aa7
ql/src/java/org/apache/hadoop/hive/ql/parse/HiveParser.g ab1188a
ql/src/java/org/apache/hadoop/hive/ql/parse/SemanticAnalyzer.java 51838ae
ql/src/java/org/apache/hadoop/hive/ql/parse/SemanticAnalyzerFactory.java
268920a
ql/src/java/org/apache/hadoop/hive/ql/plan/ColumnStatsUpdateWork.java
PRE-CREATION
ql/src/java/org/apache/hadoop/hive/ql/plan/DDLWork.java 79d9d16
Diff: https://reviews.apache.org/r/24289/diff/
Testing
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Thanks,
pengcheng xiong
