Zhengchao Shi created FLINK-19446:
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Summary: canal-json has a situation that -U and +U are equal, when
updating the null field to be non-null
Key: FLINK-19446
URL: https://issues.apache.org/jira/browse/FLINK-19446
Project: Flink
Issue Type: Bug
Components: Formats (JSON, Avro, Parquet, ORC, SequenceFile)
Affects Versions: 1.11.1
Reporter: Zhengchao Shi
Fix For: 1.12.0
line 118 in CanalJsonDeserializationSchema#deserialize method:
{code:java}
GenericRowData after = (GenericRowData) data.getRow(i, fieldCount);
GenericRowData before = (GenericRowData) old.getRow(i, fieldCount);
for (int f = 0; f < fieldCount; f++) {
if (before.isNullAt(f)) {
// not null fields in "old" (before) means the fields are
changed
// null/empty fields in "old" (before) means the fields are not
changed
// so we just copy the not changed fields into before
before.setField(f, after.getField(f));
}
}
before.setRowKind(RowKind.UPDATE_BEFORE);
after.setRowKind(RowKind.UPDATE_AFTER);
{code}
if a field is null before update,it will cause -U and +U to be equal
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