Qifan Chen has uploaded a new patch set (#34). (
http://gerrit.cloudera.org:8080/16720 )
Change subject: IMPALA-10325: Parquet scan should use min/max statistics to
skip pages based on equi-join predicate
......................................................................
IMPALA-10325: Parquet scan should use min/max statistics to skip pages based on
equi-join predicate
This patch adds a new class of predicates called overlap predicates
to aid in the determination of whether a Parquet row group or a page
overlap with a range computed from an equi hash join. If not, then
the entire row group or page are skipped. An overlap predicate exists
as a min/max filter.
For the following query, the min and max in such a min/max filter are
computed with the values from the join column from table 'b' and become
fully available when the entire hash table is built. To evaluate the
overlap predicate, these two values are compared against the min/max
of each row group or page at the scan node for 'a'.
select straight_join count(*)
from lineitem_sorted_l_shipdate a join [SHUFFLE]
lineitem_sorted_l_shipdate b
where a.l_shipdate = b.l_receiptdate
and b.l_commitdate = "1992-01-31";
An overlap predicate associated with the column type J (in hash table)
and scan column type S will be formed when one of the following is true:
Both J and S are booleans
Both J and S are integers (tinyint, smallint, int, or bigint)
Both J and S are approximate numeric (float or double)
Both J and S are Decimals with the same precision and scale
Both J and S are strings (STRING, CHAR or VARCHAR)
Both J and S are date
Both J and S are timestamp
Like any existing min/max filters, MAX_NUM_RUNTIME_FILTERS query option
does not apply to min/max filters created for overlap predicates.
The overlap predicates will always be evaluated, after the min/max
conjuncts (if any).
Two new run-time profile counters are added to report the number of row
groups or pages filtered out via the overlap predicates respectively:
1. NumRuntimeFilteredRowGroups
2. NumRuntimeFilteredPages
Testing:
1. Unit tested on various column types with TPCH and TPCDS tables.
Benefits were significant when the join column on the outer table
is sorted, or when the min/max boundary values of the pages or row
groups are monotonic;
2. Added new tests in min_max_filters.test for join column type
compatibility and to demonstrate the number of filtered out pages
and row groups with the two new profile counters;
3. Added data type specific overlap method tests in
min-max-filter-test.cc;
4. Core testing.
TBD in this patch:
1. Performance measurement.
To do in follow-up JIRAs:
1. Apply the overlap predicate on partition columns;
2. IR code-gen for various MinMaxFilter::EvalOverlap methods.
Change-Id: I379405ee75b14929df7d6b5d20dabc6f51375691
---
M be/src/exec/exec-node.h
M be/src/exec/hdfs-scan-node-base.cc
M be/src/exec/hdfs-scan-node-base.h
M be/src/exec/parquet/hdfs-parquet-scanner.cc
M be/src/exec/parquet/hdfs-parquet-scanner.h
M be/src/exec/parquet/parquet-column-stats.cc
M be/src/exec/parquet/parquet-column-stats.h
M be/src/exec/partitioned-hash-join-builder.cc
M be/src/exec/scan-node.cc
M be/src/runtime/coordinator.cc
M be/src/runtime/date-value.cc
M be/src/runtime/date-value.h
M be/src/runtime/runtime-filter-ir.cc
M be/src/runtime/timestamp-value.cc
M be/src/runtime/timestamp-value.h
M be/src/service/query-options.cc
M be/src/service/query-options.h
M be/src/util/min-max-filter-test.cc
M be/src/util/min-max-filter.cc
M be/src/util/min-max-filter.h
M common/thrift/ImpalaInternalService.thrift
M common/thrift/ImpalaService.thrift
M common/thrift/PlanNodes.thrift
M fe/src/main/java/org/apache/impala/analysis/TupleDescriptor.java
M fe/src/main/java/org/apache/impala/planner/HdfsScanNode.java
M fe/src/main/java/org/apache/impala/planner/RuntimeFilterGenerator.java
M testdata/workloads/functional-query/queries/QueryTest/min_max_filters.test
27 files changed, 1,318 insertions(+), 160 deletions(-)
git pull ssh://gerrit.cloudera.org:29418/Impala-ASF refs/changes/20/16720/34
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Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-MessageType: newpatchset
Gerrit-Change-Id: I379405ee75b14929df7d6b5d20dabc6f51375691
Gerrit-Change-Number: 16720
Gerrit-PatchSet: 34
Gerrit-Owner: Qifan Chen <qc...@cloudera.com>
Gerrit-Reviewer: Csaba Ringhofer <csringho...@cloudera.com>
Gerrit-Reviewer: Impala Public Jenkins <impala-public-jenk...@cloudera.com>
Gerrit-Reviewer: Qifan Chen <qc...@cloudera.com>
Gerrit-Reviewer: Tim Armstrong <tarmstr...@cloudera.com>
Gerrit-Reviewer: Zoltan Borok-Nagy <borokna...@cloudera.com>
