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04d027df13
It was disabled for performance reasons (IMPALA-1003) and this patch re-enables it since a lot of codegen improvements have happened since then. This patch switches the aggregation to use the CASE conditional instead of IF since the former has proper codegen support (IMPALA-7655). Tests: ===== - Updated the affected tests to include the null counts. - Added unit tests that verify IS [NOT] NULL predicates' cardinality estimation. Perf note: ========= I reran the compute stats child query with null counts included on the store_sales table from 1000 SF (1TB) tpcds dataset. The table had 22 non-partitioned columns (on which null counts were computed) and ~2.8B rows. This experiment showed around 7-8% perf drop compared to the same child query without null counts for these columns. Change-Id: Ic68f8b4c3756eb1980ce299a602a7d56db1e507a Reviewed-on: http://gerrit.cloudera.org:8080/11565 Reviewed-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com> Tested-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com>
152 lines
5.4 KiB
Plaintext
152 lines
5.4 KiB
Plaintext
====
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---- QUERY
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create external table alltypes_clone like functional_parquet.alltypes
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location '$FILESYSTEM_PREFIX/test-warehouse/alltypes_parquet';
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alter table alltypes_clone recover partitions;
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====
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---- QUERY
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# Set various column stats.
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alter table alltypes_clone set column stats double_col ('numDVs'='2');
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alter table alltypes_clone set column stats timestamp_col ('numNulls'='9');
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alter table alltypes_clone set column stats int_col ('numDVs'='100','numNulls'='20');
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alter table alltypes_clone set column stats string_col ('maxSize'='555','avgSize'='60');
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====
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---- QUERY
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show column stats alltypes_clone
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---- LABELS
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COLUMN, TYPE, #DISTINCT VALUES, #NULLS, MAX SIZE, AVG SIZE
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---- RESULTS
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'id','INT',-1,-1,4,4
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'bool_col','BOOLEAN',-1,-1,1,1
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'tinyint_col','TINYINT',-1,-1,1,1
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'smallint_col','SMALLINT',-1,-1,2,2
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'int_col','INT',100,20,4,4
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'bigint_col','BIGINT',-1,-1,8,8
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'float_col','FLOAT',-1,-1,4,4
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'double_col','DOUBLE',2,-1,8,8
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'date_string_col','STRING',-1,-1,-1,-1
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'string_col','STRING',-1,-1,555,60
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'timestamp_col','TIMESTAMP',-1,9,16,16
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'year','INT',2,0,4,4
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'month','INT',12,0,4,4
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---- TYPES
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STRING, STRING, BIGINT, BIGINT, BIGINT, DOUBLE
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====
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---- QUERY
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# Make sure compute stats still works.
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compute stats alltypes_clone
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---- RESULTS
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'Updated 24 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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# Reset the column stats to an unknown state by setting the values to -1
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alter table alltypes_clone set column stats double_col ('numDVs'='-1');
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alter table alltypes_clone set column stats timestamp_col ('numNulls'='-1');
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alter table alltypes_clone set column stats int_col ('numDVs'='-1','numNulls'='-1');
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alter table alltypes_clone set column stats string_col ('maxSize'='-1','avgSize'='-1');
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====
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---- QUERY
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show column stats alltypes_clone
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---- LABELS
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COLUMN, TYPE, #DISTINCT VALUES, #NULLS, MAX SIZE, AVG SIZE
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---- RESULTS
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'id','INT',7300,0,4,4
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'bool_col','BOOLEAN',2,0,1,1
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'tinyint_col','TINYINT',10,0,1,1
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'smallint_col','SMALLINT',10,0,2,2
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'int_col','INT',-1,-1,4,4
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'bigint_col','BIGINT',10,0,8,8
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'float_col','FLOAT',10,0,4,4
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'double_col','DOUBLE',-1,0,8,8
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'date_string_col','STRING',736,0,8,8
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'string_col','STRING',10,0,-1,-1
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'timestamp_col','TIMESTAMP',7300,-1,16,16
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'year','INT',2,0,4,4
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'month','INT',12,0,4,4
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---- TYPES
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STRING, STRING, BIGINT, BIGINT, BIGINT, DOUBLE
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====
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---- QUERY
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# Also alter a few 'numRows' parameters to make sure manually setting all stats works.
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alter table alltypes_clone partition(year=2009,month=2) set tblproperties('numRows'='280');
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alter table alltypes_clone set tblproperties('numRows'='7300');
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====
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---- QUERY
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# Check that we can query the table.
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select id, int_col, double_col, string_col, timestamp_col from alltypes_clone
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where year = 2009 and month between 2 and 3 and int_col = 9 and id between 300 and 400
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---- RESULTS
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319,9,90.89999999999999,'9',2009-02-01 00:09:00.360000000
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329,9,90.89999999999999,'9',2009-02-02 00:19:00.810000000
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339,9,90.89999999999999,'9',2009-02-03 00:29:01.260000000
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349,9,90.89999999999999,'9',2009-02-04 00:39:01.710000000
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359,9,90.89999999999999,'9',2009-02-05 00:49:02.160000000
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369,9,90.89999999999999,'9',2009-02-06 00:59:02.610000000
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379,9,90.89999999999999,'9',2009-02-07 01:09:03.600000000
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389,9,90.89999999999999,'9',2009-02-08 01:19:03.510000000
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399,9,90.89999999999999,'9',2009-02-09 01:29:03.960000000
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---- TYPES
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INT, INT, DOUBLE, STRING, TIMESTAMP
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====
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---- QUERY
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# Similar test on an HBase table.
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create external table alltypes_hbase_clone like functional_hbase.alltypes
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====
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---- QUERY
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alter table alltypes_hbase_clone set column stats double_col ('numDVs'='2');
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alter table alltypes_hbase_clone set column stats timestamp_col ('numNulls'='9');
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alter table alltypes_hbase_clone set column stats int_col ('numDVs'='100','numNulls'='20');
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alter table alltypes_hbase_clone set column stats string_col ('maxSize'='555','avgSize'='60');
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====
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---- QUERY
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show column stats alltypes_hbase_clone
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---- LABELS
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COLUMN, TYPE, #DISTINCT VALUES, #NULLS, MAX SIZE, AVG SIZE
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---- RESULTS
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'id','INT',-1,-1,4,4
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'bool_col','BOOLEAN',-1,-1,1,1
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'tinyint_col','TINYINT',-1,-1,1,1
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'smallint_col','SMALLINT',-1,-1,2,2
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'int_col','INT',100,20,4,4
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'bigint_col','BIGINT',-1,-1,8,8
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'float_col','FLOAT',-1,-1,4,4
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'double_col','DOUBLE',2,-1,8,8
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'date_string_col','STRING',-1,-1,-1,-1
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'string_col','STRING',-1,-1,555,60
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'timestamp_col','TIMESTAMP',-1,9,16,16
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'year','INT',-1,-1,4,4
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'month','INT',-1,-1,4,4
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---- TYPES
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STRING, STRING, BIGINT, BIGINT, BIGINT, DOUBLE
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====
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---- QUERY
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# Reset the column stats to an unknown state by setting the values to -1
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alter table alltypes_hbase_clone set column stats double_col ('numDVs'='-1');
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alter table alltypes_hbase_clone set column stats timestamp_col ('numNulls'='-1');
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alter table alltypes_hbase_clone set column stats int_col ('numDVs'='-1','numNulls'='-1');
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alter table alltypes_hbase_clone set column stats string_col ('maxSize'='-1','avgSize'='-1');
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====
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---- QUERY
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show column stats alltypes_hbase_clone
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---- LABELS
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COLUMN, TYPE, #DISTINCT VALUES, #NULLS, MAX SIZE, AVG SIZE
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---- RESULTS
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'id','INT',-1,-1,4,4
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'bool_col','BOOLEAN',-1,-1,1,1
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'tinyint_col','TINYINT',-1,-1,1,1
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'smallint_col','SMALLINT',-1,-1,2,2
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'int_col','INT',-1,-1,4,4
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'bigint_col','BIGINT',-1,-1,8,8
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'float_col','FLOAT',-1,-1,4,4
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'double_col','DOUBLE',-1,-1,8,8
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'date_string_col','STRING',-1,-1,-1,-1
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'string_col','STRING',-1,-1,-1,-1
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'timestamp_col','TIMESTAMP',-1,-1,16,16
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'year','INT',-1,-1,4,4
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'month','INT',-1,-1,4,4
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---- TYPES
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STRING, STRING, BIGINT, BIGINT, BIGINT, DOUBLE
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====
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