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https://issues.apache.org/jira/browse/BEAM-7013?focusedWorklogId=337110&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-337110
]
ASF GitHub Bot logged work on BEAM-7013:
----------------------------------------
Author: ASF GitHub Bot
Created on: 01/Nov/19 00:23
Start Date: 01/Nov/19 00:23
Worklog Time Spent: 10m
Work Description: robinyqiu commented on pull request #9778: [BEAM-7013]
Update BigQueryHllSketchCompatibilityIT to cover empty sketch cases
URL: https://github.com/apache/beam/pull/9778#discussion_r341414587
##########
File path:
sdks/java/extensions/zetasketch/src/test/java/org/apache/beam/sdk/extensions/zetasketch/BigQueryHllSketchCompatibilityIT.java
##########
@@ -126,22 +145,49 @@ public static void deleteDataset() throws Exception {
}
/**
- * Test that HLL++ sketch computed in BigQuery can be processed by Beam. Hll
sketch is computed by
- * {@code HLL_COUNT.INIT} in BigQuery and read into Beam; the test verifies
that we can run {@link
- * HllCount.MergePartial} and {@link HllCount.Extract} on the sketch in Beam
to get the correct
- * estimated count.
+ * Test that non-empty HLL++ sketch computed in BigQuery can be processed by
Beam.
+ *
+ * <p>Hll sketch is computed by {@code HLL_COUNT.INIT} in BigQuery and read
into Beam; the test
+ * verifies that we can run {@link HllCount.MergePartial} and {@link
HllCount.Extract} on the
+ * sketch in Beam to get the correct estimated count.
+ */
+ @Test
+ public void testReadNonEmptySketchFromBigQuery() {
+ readSketchFromBigQuery(DATA_TABLE_ID_NON_EMPTY, EXPECTED_COUNT_NON_EMPTY);
+ }
+
+ /**
+ * Test that empty HLL++ sketch computed in BigQuery can be processed by
Beam.
+ *
+ * <p>Hll sketch is computed by {@code HLL_COUNT.INIT} in BigQuery and read
into Beam; the test
+ * verifies that we can run {@link HllCount.MergePartial} and {@link
HllCount.Extract} on the
+ * sketch in Beam to get the correct estimated count.
*/
@Test
- public void testReadSketchFromBigQuery() {
- String tableSpec = String.format("%s.%s", DATASET_ID, DATA_TABLE_ID);
+ public void testReadEmptySketchFromBigQuery() {
+ readSketchFromBigQuery(DATA_TABLE_ID_EMPTY, EXPECTED_COUNT_EMPTY);
+ }
+
+ private void readSketchFromBigQuery(String tableId, Long expectedCount) {
+ String tableSpec = String.format("%s.%s", DATASET_ID, tableId);
String query =
String.format(
"SELECT HLL_COUNT.INIT(%s) AS %s FROM %s",
DATA_FIELD_NAME, QUERY_RESULT_FIELD_NAME, tableSpec);
+
SerializableFunction<SchemaAndRecord, byte[]> parseQueryResultToByteArray =
- (SchemaAndRecord schemaAndRecord) ->
- // BigQuery BYTES type corresponds to Java java.nio.ByteBuffer type
- ((ByteBuffer)
schemaAndRecord.getRecord().get(QUERY_RESULT_FIELD_NAME)).array();
+ input -> {
+ // BigQuery BYTES type corresponds to Java java.nio.ByteBuffer type
+ ByteBuffer sketch = (ByteBuffer)
input.getRecord().get(QUERY_RESULT_FIELD_NAME);
+ if (sketch == null) {
+ // Empty sketch is represented by null in BigQuery and by empty
byte array in Beam
+ return new byte[0];
+ } else {
+ byte[] result = new byte[sketch.remaining()];
Review comment:
Exactly. We know that is the case by looking into `Avro`'s implementation,
but compiler does not know that, and it gives a warning if we use `.array()`.
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Issue Time Tracking
-------------------
Worklog Id: (was: 337110)
Time Spent: 35h 50m (was: 35h 40m)
> A new count distinct transform based on BigQuery compatible HyperLogLog++
> implementation
> ----------------------------------------------------------------------------------------
>
> Key: BEAM-7013
> URL: https://issues.apache.org/jira/browse/BEAM-7013
> Project: Beam
> Issue Type: New Feature
> Components: extensions-java-sketching, sdk-java-core
> Reporter: Yueyang Qiu
> Assignee: Yueyang Qiu
> Priority: Major
> Fix For: 2.16.0
>
> Time Spent: 35h 50m
> Remaining Estimate: 0h
>
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