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https://issues.apache.org/jira/browse/BEAM-12925?focusedWorklogId=656302&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-656302
]
ASF GitHub Bot logged work on BEAM-12925:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 28/Sep/21 18:04
Start Date: 28/Sep/21 18:04
Worklog Time Spent: 10m
Work Description: chrismgrayftsinc commented on a change in pull request
#15566:
URL: https://github.com/apache/beam/pull/15566#discussion_r717838656
##########
File path:
sdks/java/io/jdbc/src/main/java/org/apache/beam/sdk/io/jdbc/SchemaUtil.java
##########
@@ -351,7 +351,12 @@ private BeamRowMapper(Schema schema,
List<ResultSetFieldExtractor> fieldExtracto
public Row mapRow(ResultSet rs) throws Exception {
Row.Builder rowBuilder = Row.withSchema(schema);
for (int i = 0; i < schema.getFieldCount(); i++) {
- rowBuilder.addValue(fieldExtractors.get(i).extract(rs, i + 1));
+ Object value = fieldExtractors.get(i).extract(rs, i + 1);
+ if (rs.wasNull() && schema.getField(i).getType().getNullable()) {
+ rowBuilder.addValue(null);
+ } else {
+ rowBuilder.addValue(value);
Review comment:
Just to expand on backwards-compatibility a bit, if we added the null
value to rows where the schema did not have the field as being nullable, then
an exception would be thrown where it wasn't thrown before from
`RowFieldMatcher.match`. So the question is whether incorrect data is worse or
newly-introduced crashes are worse.
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Issue Time Tracking
-------------------
Worklog Id: (was: 656302)
Time Spent: 50m (was: 40m)
> JdbcIo readRows does not handle null numerical values properly
> --------------------------------------------------------------
>
> Key: BEAM-12925
> URL: https://issues.apache.org/jira/browse/BEAM-12925
> Project: Beam
> Issue Type: Bug
> Components: io-java-jdbc
> Affects Versions: 2.32.0
> Reporter: Chris Gray
> Priority: P2
> Time Spent: 50m
> Remaining Estimate: 0h
>
> Numerical values that are SQL NULL in the database are converted to 0 when
> read by `readRows`. This appears to be caused by SchemaUtil.java not
> checking `ResultSet::wasNull` at line 253 in version 2.32.0.
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