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Table alltypes has no statistics, so the cardinality of alltypes will be estimated based on the hdfs files and the avg row size. Calling PrintUtils.printMetric, double will be divided by long. There will be accuracy problems. In most cases, the number of lines calculated is 17.91 K. But due to accuracy problems here, the calculated value is 17.90K. I modified line 221 of stats-extrapolation.test and used row_regex to match, referring to the matching method of cardinality in line 224,in this case, their values are the same Testing: metadata/test_stats_extrapolation.py Change-Id: I0a1a3809508c90217517705b2b188b2ccba6f23f Reviewed-on: http://gerrit.cloudera.org:8080/17411 Tested-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com> Reviewed-by: Jim Apple <jbapple@apache.org>
245 lines
9.4 KiB
Plaintext
245 lines
9.4 KiB
Plaintext
====
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---- QUERY
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# This test relies on a deterministic row order so we use "sort by (id)".
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create table alltypes sort by (id) like functional_parquet.alltypes;
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alter table alltypes set tblproperties("impala.enable.stats.extrapolation"="true");
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insert into alltypes partition(year, month)
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select * from functional_parquet.alltypes where year = 2009;
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====
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---- QUERY
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explain select id from alltypes;
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---- RESULTS: VERIFY_IS_SUBSET
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' stored statistics:'
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' table: rows=unavailable size=unavailable'
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' partitions: 0/12 rows=5.97K'
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' columns: unavailable'
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row_regex:.* extrapolated-rows=unavailable.*
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' tuple-ids=0 row-size=4B cardinality=5.97K'
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---- TYPES
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STRING
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====
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---- QUERY
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# Disable the estimation of cardinality for an hdfs table withot stats.
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SET DISABLE_HDFS_NUM_ROWS_ESTIMATE=1;
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explain select id from alltypes;
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---- RESULTS: VERIFY_IS_SUBSET
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' stored statistics:'
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' table: rows=unavailable size=unavailable'
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' partitions: 0/12 rows=unavailable'
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' columns: unavailable'
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row_regex:.* extrapolated-rows=unavailable.*
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' tuple-ids=0 row-size=4B cardinality=unavailable'
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---- TYPES
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STRING
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====
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---- QUERY
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compute stats alltypes
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---- RESULTS
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'Updated 1 partition(s) and 11 column(s).'
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---- TYPES
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STRING
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====
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---- QUERY
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# Only the table-level row count is stored. The partition row counts are extrapolated.
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show table stats alltypes
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---- LABELS
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YEAR, MONTH, #ROWS, EXTRAP #ROWS, #FILES, SIZE, BYTES CACHED, CACHE REPLICATION, FORMAT, INCREMENTAL STATS, LOCATION
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---- RESULTS
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'2009','1',-1,307,1,regex:.*B,'NOT CACHED','NOT CACHED','PARQUET','false','$NAMENODE/test-warehouse/$DATABASE.db/alltypes/year=2009/month=1'
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'2009','10',-1,307,1,regex:.*B,'NOT CACHED','NOT CACHED','PARQUET','false','$NAMENODE/test-warehouse/$DATABASE.db/alltypes/year=2009/month=10'
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'2009','11',-1,302,1,regex:.*B,'NOT CACHED','NOT CACHED','PARQUET','false','$NAMENODE/test-warehouse/$DATABASE.db/alltypes/year=2009/month=11'
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'2009','12',-1,307,1,regex:.*B,'NOT CACHED','NOT CACHED','PARQUET','false','$NAMENODE/test-warehouse/$DATABASE.db/alltypes/year=2009/month=12'
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'2009','2',-1,290,1,regex:.*B,'NOT CACHED','NOT CACHED','PARQUET','false','$NAMENODE/test-warehouse/$DATABASE.db/alltypes/year=2009/month=2'
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'2009','3',-1,307,1,regex:.*B,'NOT CACHED','NOT CACHED','PARQUET','false','$NAMENODE/test-warehouse/$DATABASE.db/alltypes/year=2009/month=3'
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'2009','4',-1,302,1,regex:.*B,'NOT CACHED','NOT CACHED','PARQUET','false','$NAMENODE/test-warehouse/$DATABASE.db/alltypes/year=2009/month=4'
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'2009','5',-1,307,1,regex:.*B,'NOT CACHED','NOT CACHED','PARQUET','false','$NAMENODE/test-warehouse/$DATABASE.db/alltypes/year=2009/month=5'
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'2009','6',-1,302,1,regex:.*B,'NOT CACHED','NOT CACHED','PARQUET','false','$NAMENODE/test-warehouse/$DATABASE.db/alltypes/year=2009/month=6'
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'2009','7',-1,307,1,regex:.*B,'NOT CACHED','NOT CACHED','PARQUET','false','$NAMENODE/test-warehouse/$DATABASE.db/alltypes/year=2009/month=7'
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'2009','8',-1,307,1,regex:.*B,'NOT CACHED','NOT CACHED','PARQUET','false','$NAMENODE/test-warehouse/$DATABASE.db/alltypes/year=2009/month=8'
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'2009','9',-1,302,1,regex:.*B,'NOT CACHED','NOT CACHED','PARQUET','false','$NAMENODE/test-warehouse/$DATABASE.db/alltypes/year=2009/month=9'
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'Total','',3650,3650,12,regex:.*B,'0B','','','',''
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---- TYPES
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STRING,STRING,BIGINT,BIGINT,BIGINT,STRING,STRING,STRING,STRING,STRING,STRING
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====
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---- QUERY
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# Stats are available now.
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explain select id from alltypes;
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---- RESULTS: VERIFY_IS_EQUAL
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row_regex:.*Max Per-Host Resource Reservation: Memory=.*
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row_regex:.*Per-Host Resource Estimates: Memory=.*
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'Codegen disabled by planner'
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row_regex:.*Analyzed query: SELECT id FROM test_stats_extrapolation_.*.alltypes.*
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''
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'F00:PLAN FRAGMENT [UNPARTITIONED] hosts=1 instances=1'
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row_regex:.*Per-Host Resources: mem-estimate=.* mem-reservation=.*
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'PLAN-ROOT SINK'
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'| output exprs: id'
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row_regex:.*mem-estimate=.* mem-reservation=.*
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'|'
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'00:SCAN $FILESYSTEM_NAME [$DATABASE.alltypes]'
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row_regex:.*partitions=12/12 files=12 size=.*
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' stored statistics:'
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row_regex:.*table: rows=3.65K size=.*
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' partitions: 0/12 rows=unavailable'
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' columns: all'
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row_regex:.* extrapolated-rows=3.65K .*
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row_regex:.*mem-estimate=.* mem-reservation=.*
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' tuple-ids=0 row-size=4B cardinality=3.65K'
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' in pipelines: 00(GETNEXT)'
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---- TYPES
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STRING
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====
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---- QUERY
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# Select a subset of partitions.
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explain select id from alltypes where month in (1, 2, 3);
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---- RESULTS: VERIFY_IS_EQUAL
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row_regex:.*Max Per-Host Resource Reservation: Memory=.*
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row_regex:.*Per-Host Resource Estimates: Memory=.*
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'Codegen disabled by planner'
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row_regex:.*Analyzed query: SELECT id FROM test_stats_extrapolation_.*.alltypes WHERE.*
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'`month` IN (CAST(1 AS INT), CAST(2 AS INT), CAST(3 AS INT))'
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''
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'F00:PLAN FRAGMENT [UNPARTITIONED] hosts=1 instances=1'
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row_regex:.*mem-estimate=.* mem-reservation=.*
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'PLAN-ROOT SINK'
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'| output exprs: id'
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row_regex:.*mem-estimate=.* mem-reservation=.*
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'|'
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'00:SCAN $FILESYSTEM_NAME [$DATABASE.alltypes]'
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' partition predicates: `month` IN (CAST(1 AS INT), CAST(2 AS INT), CAST(3 AS INT))'
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row_regex:.*partitions=3/12 files=3 size=.*
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' stored statistics:'
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row_regex:.*table: rows=3.65K size=.*
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' partitions: 0/3 rows=unavailable'
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' columns: all'
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row_regex:.* extrapolated-rows=904.*
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row_regex:.*mem-estimate=.* mem-reservation=.*
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' tuple-ids=0 row-size=4B cardinality=904'
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' in pipelines: 00(GETNEXT)'
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---- TYPES
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STRING
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====
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---- QUERY
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# Double the data in existing partitions.
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insert into alltypes partition(year, month)
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select * from functional_parquet.alltypes where year = 2009;
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explain select id from alltypes;
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---- RESULTS: VERIFY_IS_EQUAL
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row_regex:.*Max Per-Host Resource Reservation: Memory=.*
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row_regex:.*Per-Host Resource Estimates: Memory=.*
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row_regex:.*Analyzed query: SELECT id FROM test_stats_extrapolation_.*.alltypes.*
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''
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'F00:PLAN FRAGMENT [UNPARTITIONED] hosts=1 instances=1'
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row_regex:.*Per-Host Resources: mem-estimate=.* mem-reservation=.*
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'PLAN-ROOT SINK'
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'| output exprs: id'
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row_regex:.*mem-estimate=.* mem-reservation=.*
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'|'
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'00:SCAN $FILESYSTEM_NAME [$DATABASE.alltypes]'
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row_regex:.*partitions=12/12 files=24 size=.*
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' stored statistics:'
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row_regex:.*table: rows=3.65K size=.*
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' partitions: 0/12 rows=unavailable'
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' columns: all'
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row_regex:.* extrapolated-rows=7.30K .*
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row_regex:.*mem-estimate=.* mem-reservation=.*
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' tuple-ids=0 row-size=4B cardinality=7.30K'
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' in pipelines: 00(GETNEXT)'
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---- TYPES
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STRING
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====
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---- QUERY
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# Create new partitions and extrapolate their row count.
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insert into alltypes partition(year, month)
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select * from functional_parquet.alltypes where year = 2010;
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explain select id from alltypes where year = 2010;
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---- RESULTS: VERIFY_IS_EQUAL
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row_regex:.*Max Per-Host Resource Reservation: Memory=.*
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row_regex:.*Per-Host Resource Estimates: Memory=20MB.*
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'Codegen disabled by planner'
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row_regex:.*Analyzed query: SELECT id FROM test_stats_extrapolation_.*.alltypes WHERE.*
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'`year` = CAST(2010 AS INT)'
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''
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'F00:PLAN FRAGMENT [UNPARTITIONED] hosts=1 instances=1'
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row_regex:.*Per-Host Resources: mem-estimate=.* mem-reservation=.*
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'PLAN-ROOT SINK'
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'| output exprs: id'
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row_regex:.*mem-estimate=.* mem-reservation=.*
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'|'
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'00:SCAN $FILESYSTEM_NAME [$DATABASE.alltypes]'
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' partition predicates: `year` = CAST(2010 AS INT)'
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row_regex:.*partitions=12/24 files=12 size=.*
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' stored statistics:'
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row_regex:.*table: rows=3.65K size=.*
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' partitions: 0/12 rows=unavailable'
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' columns: all'
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row_regex:.* extrapolated-rows=3.65K .*
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row_regex:.*mem-estimate=.* mem-reservation=.*
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' tuple-ids=0 row-size=4B cardinality=3.65K'
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' in pipelines: 00(GETNEXT)'
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---- TYPES
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STRING
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====
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---- QUERY
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# Compute stats and run the same query again.
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compute stats alltypes;
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explain select id from alltypes where year = 2010;
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---- RESULTS: VERIFY_IS_EQUAL
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row_regex:.*Max Per-Host Resource Reservation: Memory=.*
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row_regex:.*Per-Host Resource Estimates: Memory=20MB.*
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'Codegen disabled by planner'
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row_regex:.*Analyzed query: SELECT id FROM test_stats_extrapolation_.*.alltypes WHERE.*
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'`year` = CAST(2010 AS INT)'
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''
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'F00:PLAN FRAGMENT [UNPARTITIONED] hosts=1 instances=1'
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row_regex:.*Per-Host Resources: mem-estimate=.* mem-reservation=.*
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'PLAN-ROOT SINK'
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'| output exprs: id'
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row_regex:.*mem-estimate=.* mem-reservation=.*
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'|'
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'00:SCAN $FILESYSTEM_NAME [$DATABASE.alltypes]'
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' partition predicates: `year` = CAST(2010 AS INT)'
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row_regex:.*partitions=12/24 files=12 size=.*
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' stored statistics:'
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row_regex:.*table: rows=10.95K size=.*
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' partitions: 0/12 rows=unavailable'
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' columns: all'
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row_regex:.* extrapolated-rows=3.65K .*
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row_regex:.*mem-estimate=.* mem-reservation=.*
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' tuple-ids=0 row-size=4B cardinality=3.65K'
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' in pipelines: 00(GETNEXT)'
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---- TYPES
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STRING
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====
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---- QUERY
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# Test that dropping stats resets everything.
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drop stats alltypes;
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explain select id from alltypes;
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---- RESULTS: VERIFY_IS_SUBSET
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' stored statistics:'
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' table: rows=unavailable size=unavailable'
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row_regex:.* partitions: 0/24 rows=17\.9.*K
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' columns: unavailable'
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row_regex:.* extrapolated-rows=unavailable.*
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row_regex:.* tuple-ids=0 row-size=4B cardinality=17\.9.*K
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' in pipelines: 00(GETNEXT)'
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---- TYPES
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STRING
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====
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---- QUERY
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# Test that dropping stats resets everything.
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SET DISABLE_HDFS_NUM_ROWS_ESTIMATE=1;
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drop stats alltypes;
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explain select id from alltypes;
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---- RESULTS: VERIFY_IS_SUBSET
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' stored statistics:'
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' table: rows=unavailable size=unavailable'
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' partitions: 0/24 rows=unavailable'
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' columns: unavailable'
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row_regex:.* extrapolated-rows=unavailable.*
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' tuple-ids=0 row-size=4B cardinality=unavailable'
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' in pipelines: 00(GETNEXT)'
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---- TYPES
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STRING
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====
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