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From "ASF GitHub Bot (Jira)" <j...@apache.org>
Subject [jira] [Work logged] (BEAM-12100) SUM should error when overflow/underflow occurs.
Date Thu, 05 Aug 2021 16:39:00 GMT

     [ https://issues.apache.org/jira/browse/BEAM-12100?focusedWorklogId=634667&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-634667
]

ASF GitHub Bot logged work on BEAM-12100:
-----------------------------------------

                Author: ASF GitHub Bot
            Created on: 05/Aug/21 16:38
            Start Date: 05/Aug/21 16:38
    Worklog Time Spent: 10m 
      Work Description: benWize commented on a change in pull request #15174:
URL: https://github.com/apache/beam/pull/15174#discussion_r683616139



##########
File path: sdks/java/extensions/sql/src/main/java/org/apache/beam/sdk/extensions/sql/impl/rel/BeamAggregationRel.java
##########
@@ -246,6 +250,67 @@ private Transform(
 
       validateWindowIsSupported(windowedStream);
 
+      PTransform<PCollection<Row>, PCollection<Row>> combiner = createCombiner();
+
+      boolean verifyRowValues =
+          pinput.getPipeline().getOptions().as(BeamSqlPipelineOptions.class).getVerifyRowValues();
+      return windowedStream
+          .apply(combiner)
+          .apply(
+              "mergeRecord",
+              ParDo.of(mergeRecord(outputSchema, windowFieldIndex, ignoreValues, verifyRowValues)))
+          .setRowSchema(outputSchema);
+    }
+
+    private PTransform<PCollection<Row>, PCollection<Row>> createCombiner()
{
+      // Check if have fields to be grouped
+      if (groupSetCount > 0) {
+        return createGroupCombiner();
+      }
+      return createGlobalCombiner();
+    }
+
+    private PTransform<PCollection<Row>, PCollection<Row>> createGlobalCombiner()
{
+      org.apache.beam.sdk.schemas.transforms.Group.Global<Row> globally =
+          org.apache.beam.sdk.schemas.transforms.Group.globally();
+      org.apache.beam.sdk.schemas.transforms.Group.CombineFieldsGlobally<Row> combined
= null;
+      for (FieldAggregation fieldAggregation : fieldAggregations) {
+        List<Integer> inputs = fieldAggregation.inputs;
+        CombineFn combineFn = fieldAggregation.combineFn;
+        if (inputs.size() > 1 || inputs.isEmpty()) {
+          // In this path we extract a Row (an empty row if inputs.isEmpty).
+          combined =
+              (combined == null)
+                  ? globally.aggregateFieldsById(inputs, combineFn, fieldAggregation.outputField)
+                  : combined.aggregateFieldsById(inputs, combineFn, fieldAggregation.outputField);
+        } else {
+          // Combining over a single field, so extract just that field.
+          combined =
+              (combined == null)
+                  ? globally.aggregateField(inputs.get(0), combineFn, fieldAggregation.outputField)
+                  : combined.aggregateField(inputs.get(0), combineFn, fieldAggregation.outputField);
+        }
+      }
+
+      PTransform<PCollection<Row>, PCollection<Row>> combiner = combined;
+      if (combiner == null) {
+        // If no field aggregations were specified, we run a constant combiner that always
returns
+        // a single empty row for each key. This is used by the SELECT DISTINCT query plan
- in this
+        // case a group by is generated to determine unique keys, and a constant null combiner
is
+        // used.
+        combiner =
+            globally.aggregateField(
+                "*",
+                AggregationCombineFnAdapter.createConstantCombineFn(),
+                Field.of(
+                    "e",
+                    FieldType.row(AggregationCombineFnAdapter.EMPTY_SCHEMA).withNullable(true)));
+        ignoreValues = true;
+      }
+      return combiner;
+    }

Review comment:
       I created `LongSum` to handle ArithmeticExceptions like Sumoverflow and Sumunderflow,
without modifying the original Sum.ofLongs.




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Issue Time Tracking
-------------------

    Worklog Id:     (was: 634667)
    Time Spent: 2h 20m  (was: 2h 10m)

> SUM should error when overflow/underflow occurs.
> ------------------------------------------------
>
>                 Key: BEAM-12100
>                 URL: https://issues.apache.org/jira/browse/BEAM-12100
>             Project: Beam
>          Issue Type: Bug
>          Components: dsl-sql-zetasql
>            Reporter: Kyle Weaver
>            Assignee: Benjamin Gonzalez
>            Priority: P3
>          Time Spent: 2h 20m
>  Remaining Estimate: 0h
>
> SELECT SUM(col1) FROM (SELECT CAST(9223372036854775807 as int64) as col1 UNION ALL SELECT
CAST(1 as int64))
> should return an error.



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