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[IMPALA-3304] Aggregations do not always spill when exprs use large amount of memory
...This was reported by a user, and I was able to reproduce locally on a TPC-DS 100 data set.Large aggregations with avg() hit OOM before spilling, so spill-to-disk is not effective. See below ...
, 2017-07-26, 17:52
[IMPALA-3931] Support UDAs with fixed-size intermediate type
...We should support fixed-size intermediate types for UDAs that can contain arbitrary structures. Currently these have to be allocated and stored in variable-length string values. E.g. average...
, 2017-07-26, 17:39
[IMPALA-2708] Partitioned aggregation node repartitions when spilled partition could fit in memory
...The partitioned aggregation node always repartitions spilled partitions. This often doesn't make sense, because if only a small number of partitions were spilled, it's likely that a single p...
, 2017-07-26, 17:20
[IMPALA-5586] Null-aware anti-join can take a long time to cancel
...Queries with a null-aware anti-join joining on a large number of NULLs can take a long time to cancel if threads are stuck in PartitionedHashJoinNode::EvaluateNullProbe().Reproduction: Run t...
, 2017-07-26, 16:35
[IMPALA-5573] Support decimal codegen in text scanner
...Codegen is disabled when scanning text tables with decimal columns. The message is "Decimal not yet supported for codegen."The supported types use cross-compiled conversion functions in Text...
, 2017-07-26, 00:27
[IMPALA-5572] Support timestamp codegen for text scanner
...Codegen is disabled when scanning text tables with timestamp columns. The message is "Timestamp not yet supported for codegen."The supported types use cross-compiled conversion functions in ...
, 2017-07-26, 00:26
[IMPALA-5713] Consider always reserving memory for grouping pre-aggregations
...The initial IMPALA-3200 code added the ability for a grouping pre-aggregation to run with zero reservation, passing through all of the rows. However, this is a very low performance mode for ...
, 2017-07-25, 21:04
[IMPALA-5720] FunctionContext::*Allocate*() should use TryAllocate() instead of Allocate().
...Currently the UDF interface uses Allocate(), which only returns NULL if malloc() fails. We should switch it to use TryAllocate() instead so that the query stays within the memory limit...
, 2017-07-25, 18:42
[IMPALA-5710] Stress test is not aware of aggregation passthrough under memory pressure
...The stress test currently detects whether a query spilled to disk or not. However, it doesn't detect other code paths that are triggered by memory pressure, e.g. an aggregation passing throu...
, 2017-07-25, 18:31
[IMPALA-5636] Impala writer claims that file uses BIT_PACKED encoding when it doesn't
...The Parquet writer always adds the BIT_PACKED and RLE encodings even though (I'm pretty sure) we never write out the BIT_PACKED encoding for rep or def levels. The BIT_PACKED encoding ...
, 2017-07-25, 17:52
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