[hotfix][tidb] fix RowKind.INSERT judgement condition #1104
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RowKind.INSERT is decided via
if (row.getOldValue() == null)inRowDataTiKVChangeEventDeserializationSchema:84.But when performing INSERT statements in TiDB, it produced a Row record with NOT NULL return value from
row.getOldValue()butInternal.EMPTY_BYTE_ARRAY(a String[0] array) return value fromrow.getOldValue().toByteArray(), which will produce wrong RowKind (expectINSERTbut actualUPDATE_AFTER) of the emitted RowData.Hence it should add a length judgement condition for INSERT.