Parsing datetime string with 0 to 6 decimal points for BigQuery

[damccorm]

DateTimeFormatter for BigQuery only supports 0, 3, 6 decimal point:

https://github.com/apache/beam/blob/v2.37.0/sdks/java/io/google-cloud-platform/src/main/java/org/apache/beam/sdk/io/gcp/bigquery/BigQueryUtils.java#L165

We might want to support an arbitrary number of decimal points between 0 to 6.

 

Pipeline pipeline = Pipeline.create(options);

pipeline.apply(BigQueryIO.readTableRows()

.fromQuery("select
cast("2022-02-18 11:09:12.3456" as datetime) "

"UNION ALL "

"select cast("2022-02-18 11:09:12.345678"
as datetime) ")

.usingStandardSql()

).apply(ParDo.of(new DoFn<TableRow, TableRow>() {

@ProcessElement

public
void processElement(@Element TableRow tableRow) {

System.out.println(tableRow);

 

Error stack:

Caused by: java.time.format.DateTimeParseException: Text '2022-02-18T11:09:12.3456' could not be parsed,
unparsed text found at index 19

java.time.format.DateTimeFormatter.parseResolved0(DateTimeFormatter.java:1952)

java.time.format.DateTimeFormatter.parse(DateTimeFormatter.java:1851)

java.time.LocalDateTime.parse(LocalDateTime.java:492)

org.apache.beam.sdk.io.gcp.bigquery.BigQueryUtils.toBeamValue(BigQueryUtils.java:673)

org.apache.beam.sdk.io.gcp.bigquery.BigQueryUtils.toBeamRowFieldValue(BigQueryUtils.java:636)

Imported from Jira BEAM-14114. Original Jira may contain additional context.
Reported by: heejong.

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