PREHOOK: query: -- This is to test the union->selectstar->filesink optimization -- Union of 2 map-reduce subqueries is performed followed by select star and a file sink -- There is no need to write the temporary results of the sub-queries, and then read them -- again to process the union. The union can be removed completely. -- It does not matter, whether the output is merged or not. In this case, merging is turned -- off -- INCLUDE_HADOOP_MAJOR_VERSIONS(0.23) -- Since this test creates sub-directories for the output table outputTbl1, it might be easier -- to run the test only on hadoop 23 create table inputTbl1(key string, val string) stored as textfile PREHOOK: type: CREATETABLE PREHOOK: Output: database:default PREHOOK: Output: default@inputTbl1 POSTHOOK: query: -- This is to test the union->selectstar->filesink optimization -- Union of 2 map-reduce subqueries is performed followed by select star and a file sink -- There is no need to write the temporary results of the sub-queries, and then read them -- again to process the union. The union can be removed completely. -- It does not matter, whether the output is merged or not. In this case, merging is turned -- off -- INCLUDE_HADOOP_MAJOR_VERSIONS(0.23) -- Since this test creates sub-directories for the output table outputTbl1, it might be easier -- to run the test only on hadoop 23 create table inputTbl1(key string, val string) stored as textfile POSTHOOK: type: CREATETABLE POSTHOOK: Output: database:default POSTHOOK: Output: default@inputTbl1 PREHOOK: query: create table outputTbl1(key string, `values` bigint) stored as textfile PREHOOK: type: CREATETABLE PREHOOK: Output: database:default PREHOOK: Output: default@outputTbl1 POSTHOOK: query: create table outputTbl1(key string, `values` bigint) stored as textfile POSTHOOK: type: CREATETABLE POSTHOOK: Output: database:default POSTHOOK: Output: default@outputTbl1 PREHOOK: query: load data local inpath '../../data/files/T1.txt' into table inputTbl1 PREHOOK: type: LOAD #### A masked pattern was here #### PREHOOK: Output: default@inputtbl1 POSTHOOK: query: load data local inpath '../../data/files/T1.txt' into table inputTbl1 POSTHOOK: type: LOAD #### A masked pattern was here #### POSTHOOK: Output: default@inputtbl1 PREHOOK: query: explain insert overwrite table outputTbl1 SELECT * FROM ( SELECT key, count(1) as `values` from inputTbl1 group by key UNION ALL SELECT key, count(1) as `values` from inputTbl1 group by key ) a PREHOOK: type: QUERY POSTHOOK: query: explain insert overwrite table outputTbl1 SELECT * FROM ( SELECT key, count(1) as `values` from inputTbl1 group by key UNION ALL SELECT key, count(1) as `values` from inputTbl1 group by key ) a POSTHOOK: type: QUERY STAGE DEPENDENCIES: Stage-1 is a root stage Stage-0 depends on stages: Stage-1, Stage-2 Stage-2 is a root stage STAGE PLANS: Stage: Stage-1 Map Reduce Map Operator Tree: TableScan alias: inputtbl1 Statistics: Num rows: 0 Data size: 30 Basic stats: PARTIAL Column stats: NONE Select Operator expressions: key (type: string) outputColumnNames: _col0 Statistics: Num rows: 0 Data size: 30 Basic stats: PARTIAL Column stats: NONE Group By Operator aggregations: count(1) keys: _col0 (type: string) mode: hash outputColumnNames: _col0, _col1 Statistics: Num rows: 0 Data size: 0 Basic stats: NONE Column stats: NONE Reduce Output Operator key expressions: _col0 (type: string) sort order: + Map-reduce partition columns: _col0 (type: string) Statistics: Num rows: 0 Data size: 0 Basic stats: NONE Column stats: NONE value expressions: _col1 (type: bigint) Reduce Operator Tree: Group By Operator aggregations: count(VALUE._col0) keys: KEY._col0 (type: string) mode: mergepartial outputColumnNames: _col0, _col1 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.mapred.TextInputFormat output format: org.apache.hadoop.hive.ql.io.HiveIgnoreKeyTextOutputFormat serde: org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe name: default.outputtbl1 Stage: Stage-0 Move Operator tables: replace: true table: input format: org.apache.hadoop.mapred.TextInputFormat output format: org.apache.hadoop.hive.ql.io.HiveIgnoreKeyTextOutputFormat serde: org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe name: default.outputtbl1 Stage: Stage-2 Map Reduce Map Operator Tree: TableScan alias: inputtbl1 Statistics: Num rows: 0 Data size: 30 Basic stats: PARTIAL Column stats: NONE Select Operator expressions: key (type: string) outputColumnNames: _col0 Statistics: Num rows: 0 Data size: 30 Basic stats: PARTIAL Column stats: NONE Group By Operator aggregations: count(1) keys: _col0 (type: string) mode: hash outputColumnNames: _col0, _col1 Statistics: Num rows: 0 Data size: 0 Basic stats: NONE Column stats: NONE Reduce Output Operator key expressions: _col0 (type: string) sort order: + Map-reduce partition columns: _col0 (type: string) Statistics: Num rows: 0 Data size: 0 Basic stats: NONE Column stats: NONE value expressions: _col1 (type: bigint) Reduce Operator Tree: Group By Operator aggregations: count(VALUE._col0) keys: KEY._col0 (type: string) mode: mergepartial outputColumnNames: _col0, _col1 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.mapred.TextInputFormat output format: org.apache.hadoop.hive.ql.io.HiveIgnoreKeyTextOutputFormat serde: org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe name: default.outputtbl1 PREHOOK: query: insert overwrite table outputTbl1 SELECT * FROM ( SELECT key, count(1) as `values` from inputTbl1 group by key UNION ALL SELECT key, count(1) as `values` from inputTbl1 group by key ) a PREHOOK: type: QUERY PREHOOK: Input: default@inputtbl1 PREHOOK: Output: default@outputtbl1 POSTHOOK: query: insert overwrite table outputTbl1 SELECT * FROM ( SELECT key, count(1) as `values` from inputTbl1 group by key UNION ALL SELECT key, count(1) as `values` from inputTbl1 group by key ) a POSTHOOK: type: QUERY POSTHOOK: Input: default@inputtbl1 POSTHOOK: Output: default@outputtbl1 POSTHOOK: Lineage: outputtbl1.key EXPRESSION [(inputtbl1)inputtbl1.FieldSchema(name:key, type:string, comment:null), (inputtbl1)inputtbl1.FieldSchema(name:key, type:string, comment:null), ] POSTHOOK: Lineage: outputtbl1.values EXPRESSION [(inputtbl1)inputtbl1.null, (inputtbl1)inputtbl1.null, ] PREHOOK: query: desc formatted outputTbl1 PREHOOK: type: DESCTABLE PREHOOK: Input: default@outputtbl1 POSTHOOK: query: desc formatted outputTbl1 POSTHOOK: type: DESCTABLE POSTHOOK: Input: default@outputtbl1 # col_name data_type comment key string values bigint # Detailed Table Information Database: default #### A masked pattern was here #### Protect Mode: None Retention: 0 #### A masked pattern was here #### Table Type: MANAGED_TABLE Table Parameters: COLUMN_STATS_ACCURATE false numFiles 2 numRows -1 rawDataSize -1 totalSize 40 #### A masked pattern was here #### # Storage Information SerDe Library: org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe InputFormat: org.apache.hadoop.mapred.TextInputFormat OutputFormat: org.apache.hadoop.hive.ql.io.HiveIgnoreKeyTextOutputFormat Compressed: No Num Buckets: -1 Bucket Columns: [] Sort Columns: [] Storage Desc Params: serialization.format 1 PREHOOK: query: select * from outputTbl1 order by key, `values` PREHOOK: type: QUERY PREHOOK: Input: default@outputtbl1 #### A masked pattern was here #### POSTHOOK: query: select * from outputTbl1 order by key, `values` POSTHOOK: type: QUERY POSTHOOK: Input: default@outputtbl1 #### A masked pattern was here #### 1 1 1 1 2 1 2 1 3 1 3 1 7 1 7 1 8 2 8 2