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From "Dawid Wysakowicz (Jira)" <j...@apache.org>
Subject [jira] [Created] (FLINK-15801) Timestamp extractor created from properties does not work for some physical fields
Date Wed, 29 Jan 2020 09:48:00 GMT
Dawid Wysakowicz created FLINK-15801:
----------------------------------------

             Summary: Timestamp extractor created from properties does not work for some physical
fields
                 Key: FLINK-15801
                 URL: https://issues.apache.org/jira/browse/FLINK-15801
             Project: Flink
          Issue Type: Bug
          Components: Table SQL / API
    Affects Versions: 1.9.0, 1.10.0
            Reporter: Dawid Wysakowicz
             Fix For: 1.11.0, 1.9.3, 1.10.1


If a timestamp extractor is created from properties it can not use a physical field if the
name of that field is equal to the logical field of the rowtime field.

The code below fails:
{code}
		StreamExecutionEnvironment streamExecutionEnvironment = StreamExecutionEnvironment.getExecutionEnvironment();
		streamExecutionEnvironment.setStreamTimeCharacteristic(TimeCharacteristic.EventTime);
		StreamTableEnvironment fsTableEnv = StreamTableEnvironment.create(streamExecutionEnvironment);
		String allEventsTable = "allEventsTable";
		fsTableEnv.connect(new Kafka()
			.version("universal")
			.topic("events")
			.property("zookeeper.connect", "")
			.property("bootstrap.servers", "localhost:9092")
			.property("group.id", "dummyquery").startFromLatest())
			.withSchema(new Schema()
				.field("rule_id", Types.INT)
				.field("sourceAddress", Types.STRING)
				.field("deviceProduct", Types.STRING)
				.field("destHost", Types.STRING)
				.field("extra", Types.STRING)
				.field("rowtime", Types.SQL_TIMESTAMP)
				.rowtime(new Rowtime().timestampsFromField("rowtime").watermarksPeriodicBounded(2000))

			)
			.withFormat(new Json().failOnMissingField(false).deriveSchema())
			.inAppendMode()
			.registerTableSource(allEventsTable);

		Table result = fsTableEnv.sqlQuery("select * from allEventsTable where sourceAddress='12345431'");

		DataStream alert = fsTableEnv.toAppendStream(result, Row.class);
		alert.print();
{code}

with exception:
{code}
Exception in thread "main" org.apache.flink.table.api.ValidationException: Field 'rowtime'
could not be resolved by the field mapping.
    at org.apache.flink.table.sources.TableSourceValidation.resolveField(TableSourceValidation.java:245)
    at org.apache.flink.table.sources.TableSourceValidation.lambda$validateTimestampExtractorArguments$6(TableSourceValidation.java:202)
    at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193)
    at java.util.Spliterators$ArraySpliterator.forEachRemaining(Spliterators.java:948)
    at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481)
    at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471)
    at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:545)
    at java.util.stream.AbstractPipeline.evaluateToArrayNode(AbstractPipeline.java:260)
    at java.util.stream.ReferencePipeline.toArray(ReferencePipeline.java:438)
{code}

The problem is that the field is removed from the {{FieldMapping}} in {{org.apache.flink.table.descriptors.SchemaValidator#deriveFieldMapping}}.


One possible solution could be to add: 
{code}
				if (isRowtime) {
					Optional<String> timestampSource = properties.getOptionalString(SCHEMA + "." +
i + "." + ROWTIME_TIMESTAMPS_FROM);
					timestampSource.ifPresent(s -> mapping.put(s, s));
				}
{code}

We should also consider the case what happens if we compute generated columns on fields that
were pruned in a similar way.



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