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A query that returns at most one row can run more efficiently without result spooling. If result spooling is enabled, it will set the minimum memory reservation in PlanRootSink, e.g. 'select 1' minimum memory reservation is 4MB. This optimization can reduce the statement's resource reservation and prevent the exception 'Failed to get minimum memory reservation' when the host memory limit not available. Testing: - Add tests in result-spooling.test Change-Id: Icd4d73c21106048df68a270cf03d4abd56bd3aac Reviewed-on: http://gerrit.cloudera.org:8080/18711 Reviewed-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com> Tested-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com>
96 lines
5.0 KiB
Plaintext
96 lines
5.0 KiB
Plaintext
====
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---- QUERY
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# Explain a simple hash join query.
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explain
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select *
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from tpch.lineitem join tpch.orders on l_orderkey = o_orderkey;
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---- RESULTS: VERIFY_IS_EQUAL
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row_regex:.*Max Per-Host Resource Reservation: Memory=[0-9.]*MB Threads=[0-9]*.*
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row_regex:.*Per-Host Resource Estimates: Memory=[0-9.]*MB.*
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'Analyzed query: SELECT * FROM tpch.lineitem INNER JOIN tpch.orders ON l_orderkey'
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'= o_orderkey'
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''
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'F02:PLAN FRAGMENT [UNPARTITIONED] hosts=1 instances=1'
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row_regex:.*Per-Host Resources: mem-estimate=[0-9.]*[A-Z]*B mem-reservation=[0-9.]*[A-Z]*B thread-reservation=1
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'PLAN-ROOT SINK'
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'| output exprs: tpch.lineitem.l_orderkey, tpch.lineitem.l_partkey, tpch.lineitem.l_suppkey, tpch.lineitem.l_linenumber, tpch.lineitem.l_quantity, tpch.lineitem.l_extendedprice, tpch.lineitem.l_discount, tpch.lineitem.l_tax, tpch.lineitem.l_returnflag, tpch.lineitem.l_linestatus, tpch.lineitem.l_shipdate, tpch.lineitem.l_commitdate, tpch.lineitem.l_receiptdate, tpch.lineitem.l_shipinstruct, tpch.lineitem.l_shipmode, tpch.lineitem.l_comment, tpch.orders.o_orderkey, tpch.orders.o_custkey, tpch.orders.o_orderstatus, tpch.orders.o_totalprice, tpch.orders.o_orderdate, tpch.orders.o_orderpriority, tpch.orders.o_clerk, tpch.orders.o_shippriority, tpch.orders.o_comment'
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row_regex:.*mem-estimate=[0-9.]*[A-Z]*B mem-reservation=[0-9.]*[A-Z]*B spill-buffer=[0-9.]*MB thread-reservation=0
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'|'
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'04:EXCHANGE [UNPARTITIONED]'
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row_regex:.*mem-estimate=[0-9.]*[A-Z]*B mem-reservation=[0-9.]*[A-Z]*B thread-reservation=0
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'| tuple-ids=0,1 row-size=402B cardinality=5.76M'
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'| in pipelines: 00(GETNEXT)'
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'|'
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'F00:PLAN FRAGMENT [RANDOM] hosts=3 instances=3'
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row_regex:.*Per-Host Resources: mem-estimate=[0-9.]*[A-Z]*B mem-reservation=[0-9.]*[A-Z]*B thread-reservation=.*
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'02:HASH JOIN [INNER JOIN, BROADCAST]'
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'| hash predicates: l_orderkey = o_orderkey'
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'| fk/pk conjuncts: l_orderkey = o_orderkey'
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'| runtime filters: RF000[bloom] <- o_orderkey'
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row_regex:.*mem-estimate=[0-9.]*[A-Z]*B mem-reservation=[0-9.]*[A-Z]*B spill-buffer=[0-9.]*MB thread-reservation=0.*
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'| tuple-ids=0,1 row-size=402B cardinality=5.76M'
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'| in pipelines: 00(GETNEXT), 01(OPEN)'
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'|'
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'|--03:EXCHANGE [BROADCAST]'
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row_regex:.*mem-estimate=[0-9.]*[A-Z]*B mem-reservation=[0-9.]*[A-Z]*B thread-reservation=0
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'| | tuple-ids=1 row-size=171B cardinality=1.50M'
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'| | in pipelines: 01(GETNEXT)'
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'| |'
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'| F01:PLAN FRAGMENT [RANDOM] hosts=2 instances=2'
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row_regex:.*Per-Host Resources: mem-estimate=[0-9.]*[A-Z]*B mem-reservation=[0-9.]*[A-Z]*B thread-reservation=.*
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'| 01:SCAN HDFS [tpch.orders, RANDOM]'
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row_regex:.*partitions=1/1 files=1 size=.*
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'| stored statistics:'
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row_regex:.*table: rows=[0-9.]*[A-Z]* size=.*
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'| columns: all'
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row_regex:.*extrapolated-rows=disabled max-scan-range-rows=[0-9]*.*
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row_regex:.*mem-estimate=[0-9.]*[A-Z]*B mem-reservation=[0-9.]*[A-Z]*B thread-reservation=1.*
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'| tuple-ids=1 row-size=171B cardinality=1.50M'
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'| in pipelines: 01(GETNEXT)'
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'|'
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'00:SCAN HDFS [tpch.lineitem, RANDOM]'
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row_regex:.*partitions=1/1 files=1 size=.*
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' runtime filters: RF000[bloom] -> l_orderkey'
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' stored statistics:'
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row_regex:.*table: rows=[0-9.]*[A-Z]* size=.*
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' columns: all'
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row_regex:.*extrapolated-rows=disabled max-scan-range-rows=[0-9]*.*
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row_regex:.*mem-estimate=[0-9.]*[A-Z]*B mem-reservation=[0-9.]*[A-Z]*B thread-reservation=1.*
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' tuple-ids=0 row-size=231B cardinality=6.00M'
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' in pipelines: 00(GETNEXT)'
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====
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---- QUERY
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# Tests the warning about missing table stats in the explain header.
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explain select count(t1.int_col), avg(t2.float_col), sum(t3.bigint_col)
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from functional_avro.alltypes t1
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inner join functional_parquet.alltypessmall t2 on (t1.id = t2.id)
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left outer join functional_avro.alltypes t3 on (t2.id = t3.id)
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where t1.month = 1 and t2.year = 2009 and t3.bool_col = false
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---- RESULTS: VERIFY_IS_SUBSET
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'Per-Host Resource Estimates: Memory=54MB'
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'WARNING: The following tables are missing relevant table and/or column statistics.'
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'functional_avro.alltypes, functional_parquet.alltypessmall'
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====
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---- QUERY
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# Tests the warning about missing table stats in the explain header.
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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 count(t1.int_col), avg(t2.float_col), sum(t3.bigint_col)
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from functional_avro.alltypes t1
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inner join functional_parquet.alltypessmall t2 on (t1.id = t2.id)
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left outer join functional_avro.alltypes t3 on (t2.id = t3.id)
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where t1.month = 1 and t2.year = 2009 and t3.bool_col = false
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---- RESULTS: VERIFY_IS_SUBSET
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'Per-Host Resource Estimates: Memory=4.05GB'
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'WARNING: The following tables are missing relevant table and/or column statistics.'
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'functional_avro.alltypes, functional_parquet.alltypessmall'
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====
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---- QUERY
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# Tests the set operation statement rewrite
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explain select year, month from functional.alltypes
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intersect
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select year, month from functional.alltypes where year=2009;
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---- RESULTS: VERIFY_IS_SUBSET
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'Per-Host Resources: mem-estimate=13.97MB mem-reservation=5.88MB thread-reservation=1 runtime-filters-memory=2.00MB'
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'04:HASH JOIN [LEFT SEMI JOIN, PARTITIONED]'
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==== |