Qifan Chen has uploaded a new patch set (#29). (
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 Parquet row group or the page are skipped. The new class
of overlap predicates exist as in the form of min/max filters.
For the following query, the min and max in the min/max filter are
computed after the hash table is popuated with data from table 'b'.
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 a join column of type J and a scan
column type of S will be formed provided 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 the 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. NumMinMaxFilteredRowGroups
2. NumMinMaxFilteredPages
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/decimal-value.h
M be/src/runtime/timestamp-value.cc
M be/src/runtime/timestamp-value.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/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
23 files changed, 1,272 insertions(+), 153 deletions(-)
git pull ssh://gerrit.cloudera.org:29418/Impala-ASF refs/changes/20/16720/29
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Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-MessageType: newpatchset
Gerrit-Change-Id: I379405ee75b14929df7d6b5d20dabc6f51375691
Gerrit-Change-Number: 16720
Gerrit-PatchSet: 29
Gerrit-Owner: Qifan Chen <[email protected]>
Gerrit-Reviewer: Csaba Ringhofer <[email protected]>
Gerrit-Reviewer: Impala Public Jenkins <[email protected]>
Gerrit-Reviewer: Qifan Chen <[email protected]>
Gerrit-Reviewer: Tim Armstrong <[email protected]>
Gerrit-Reviewer: Zoltan Borok-Nagy <[email protected]>
