Hello Matthew Jacobs, I'd like you to reexamine a change. Please visit
http://gerrit.cloudera.org:8080/7526 to look at the new patch set (#8). Change subject: IMPALA-3931: arbitrary fixed-size uda intermediate types ...................................................................... IMPALA-3931: arbitrary fixed-size uda intermediate types Make many builtin aggregate functions use fixed-length intermediate types: * avg() * ndv() * stddev(), variance(), etc * distinctpc(), distinctpcsa() sample(), appx_median(), histogram() and group_concat() actually allocate var-len data so aren't changed. This has some major benefits: * Spill-to-disk works properly with these aggregations. * Aggregations are more efficient because there is one less pointer indirection. * Aggregations use less memory, because we don't need an extra 12-byte StringValue for the indirection. Adds a special-purpose internal type FIXED_UDA_INTERMEDIATE. The type is represented in the same way as CHAR - a fixed-size array of bytes, stored inline in tuples. However, it is not user-visible and does not support CHAR semantics, i.e. users can't declare tables, functions, etc with the type. The pointer and length is passed into aggregate functions wrapped in a StringVal. Updates some internal codegen functions to work better with the new type. E.g. store values directly into the result tuple instead of via an intermediate stack allocation. Testing: This change only affects builtin aggregate functions, for which we have test coverage already. If we were to allow wider use of this type, it would need further testing. Added an analyzer test to ensure we can't use the type for UDAs. Added a regression test for spilling avg(). Perf: Ran TPC-H locally. TPC-H Q17, which has a high-cardinality AVG(), improved dramatically. +----------+-----------------------+---------+------------+------------+----------------+ | Workload | File Format | Avg (s) | Delta(Avg) | GeoMean(s) | Delta(GeoMean) | +----------+-----------------------+---------+------------+------------+----------------+ | TPCH(60) | parquet / none / none | 18.44 | -17.54% | 11.92 | -5.34% | +----------+-----------------------+---------+------------+------------+----------------+ +----------+----------+-----------------------+--------+-------------+------------+-----------+----------------+-------------+-------+ | Workload | Query | File Format | Avg(s) | Base Avg(s) | Delta(Avg) | StdDev(%) | Base StdDev(%) | Num Clients | Iters | +----------+----------+-----------------------+--------+-------------+------------+-----------+----------------+-------------+-------+ | TPCH(60) | TPCH-Q12 | parquet / none / none | 18.40 | 17.64 | +4.32% | 0.77% | 1.09% | 1 | 5 | | TPCH(60) | TPCH-Q22 | parquet / none / none | 7.07 | 6.90 | +2.36% | 0.28% | 0.30% | 1 | 5 | | TPCH(60) | TPCH-Q3 | parquet / none / none | 12.37 | 12.11 | +2.10% | 0.18% | 0.15% | 1 | 5 | | TPCH(60) | TPCH-Q7 | parquet / none / none | 42.48 | 42.09 | +0.93% | 2.45% | 0.80% | 1 | 5 | | TPCH(60) | TPCH-Q6 | parquet / none / none | 3.18 | 3.15 | +0.89% | 0.67% | 0.76% | 1 | 5 | | TPCH(60) | TPCH-Q19 | parquet / none / none | 7.24 | 7.20 | +0.50% | 0.95% | 0.67% | 1 | 5 | | TPCH(60) | TPCH-Q10 | parquet / none / none | 13.37 | 13.30 | +0.50% | 0.48% | 1.39% | 1 | 5 | | TPCH(60) | TPCH-Q5 | parquet / none / none | 7.47 | 7.44 | +0.36% | 0.58% | 0.54% | 1 | 5 | | TPCH(60) | TPCH-Q11 | parquet / none / none | 2.03 | 2.02 | +0.06% | 0.26% | 1.95% | 1 | 5 | | TPCH(60) | TPCH-Q4 | parquet / none / none | 5.48 | 5.50 | -0.27% | 0.62% | 1.12% | 1 | 5 | | TPCH(60) | TPCH-Q13 | parquet / none / none | 22.11 | 22.18 | -0.31% | 0.18% | 0.55% | 1 | 5 | | TPCH(60) | TPCH-Q15 | parquet / none / none | 8.45 | 8.48 | -0.32% | 0.40% | 0.47% | 1 | 5 | | TPCH(60) | TPCH-Q9 | parquet / none / none | 33.39 | 33.66 | -0.81% | 0.75% | 0.59% | 1 | 5 | | TPCH(60) | TPCH-Q21 | parquet / none / none | 71.34 | 72.07 | -1.01% | 1.84% | 1.79% | 1 | 5 | | TPCH(60) | TPCH-Q14 | parquet / none / none | 5.93 | 6.00 | -1.07% | 0.15% | 0.69% | 1 | 5 | | TPCH(60) | TPCH-Q20 | parquet / none / none | 5.72 | 5.79 | -1.09% | 0.59% | 0.51% | 1 | 5 | | TPCH(60) | TPCH-Q18 | parquet / none / none | 45.42 | 45.93 | -1.10% | 1.42% | 0.50% | 1 | 5 | | TPCH(60) | TPCH-Q2 | parquet / none / none | 4.81 | 4.89 | -1.52% | 1.68% | 1.01% | 1 | 5 | | TPCH(60) | TPCH-Q16 | parquet / none / none | 5.41 | 5.52 | -1.98% | 0.66% | 0.73% | 1 | 5 | | TPCH(60) | TPCH-Q1 | parquet / none / none | 27.58 | 29.13 | -5.34% | 0.24% | 1.51% | 1 | 5 | | TPCH(60) | TPCH-Q8 | parquet / none / none | 12.61 | 14.30 | -11.78% | 6.20% | * 15.28% * | 1 | 5 | | TPCH(60) | TPCH-Q17 | parquet / none / none | 43.74 | 126.58 | I -65.44% | 1.34% | 9.60% | 1 | 5 | +----------+----------+-----------------------+--------+-------------+------------+-----------+----------------+-------------+-------+ Change-Id: Ife90cf27989f98ffb5ef5c39f1e09ce92e8cb87c --- M be/src/codegen/codegen-anyval.cc M be/src/codegen/codegen-anyval.h M be/src/codegen/llvm-codegen.cc M be/src/exec/hash-table.cc M be/src/exec/incr-stats-util.cc M be/src/exec/partitioned-aggregation-node.cc M be/src/exprs/agg-fn-evaluator.cc M be/src/exprs/aggregate-functions-ir.cc M be/src/exprs/anyval-util.cc M be/src/exprs/anyval-util.h M be/src/exprs/scalar-expr-evaluator.cc M be/src/exprs/slot-ref.cc M be/src/exprs/utility-functions-ir.cc M be/src/runtime/raw-value.cc M be/src/runtime/types.cc M be/src/runtime/types.h M be/src/udf/udf.h M common/thrift/Types.thrift M fe/src/main/java/org/apache/impala/catalog/BuiltinsDb.java M fe/src/main/java/org/apache/impala/catalog/Function.java M fe/src/main/java/org/apache/impala/catalog/PrimitiveType.java M fe/src/main/java/org/apache/impala/catalog/ScalarType.java M fe/src/main/java/org/apache/impala/catalog/Type.java M fe/src/main/java/org/apache/impala/service/MetadataOp.java M fe/src/test/java/org/apache/impala/analysis/AnalyzeDDLTest.java M fe/src/test/java/org/apache/impala/service/FrontendTest.java M testdata/workloads/functional-planner/queries/PlannerTest/spillable-buffer-sizing.test M testdata/workloads/functional-query/queries/QueryTest/alloc-fail-init.test M testdata/workloads/functional-query/queries/QueryTest/functions-ddl.test A testdata/workloads/functional-query/queries/QueryTest/spilling-aggs.test M testdata/workloads/functional-query/queries/QueryTest/spilling.test M tests/query_test/test_spilling.py 32 files changed, 544 insertions(+), 411 deletions(-) git pull ssh://gerrit.cloudera.org:29418/Impala-ASF refs/changes/26/7526/8 -- To view, visit http://gerrit.cloudera.org:8080/7526 To unsubscribe, visit http://gerrit.cloudera.org:8080/settings Gerrit-MessageType: newpatchset Gerrit-Change-Id: Ife90cf27989f98ffb5ef5c39f1e09ce92e8cb87c Gerrit-PatchSet: 8 Gerrit-Project: Impala-ASF Gerrit-Branch: master Gerrit-Owner: Tim Armstrong <tarmstr...@cloudera.com> Gerrit-Reviewer: Matthew Jacobs <m...@cloudera.com> Gerrit-Reviewer: Michael Ho Gerrit-Reviewer: Tim Armstrong <tarmstr...@cloudera.com>