marton-bod commented on a change in pull request #2052:
URL: https://github.com/apache/iceberg/pull/2052#discussion_r554892044
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File path: mr/src/main/java/org/apache/iceberg/mr/hive/HiveIcebergSerDe.java
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@@ -82,7 +81,17 @@ public void initialize(@Nullable Configuration
configuration, Properties serDePr
}
String[] selectedColumns =
ColumnProjectionUtils.getReadColumnNames(configuration);
- Schema projectedSchema = selectedColumns.length > 0 ?
tableSchema.select(selectedColumns) : tableSchema;
+ // When same table is joined multiple times, it is possible some selected
columns are duplicated,
+ // in this case wrong recordStructField position leads wrong value or
ArrayIndexOutOfBoundException
+ String[] distinctSelectedColumns =
Arrays.stream(selectedColumns).distinct().toArray(String[]::new);
+ Schema projectedSchema = distinctSelectedColumns.length > 0 ?
+ tableSchema.select(distinctSelectedColumns) : tableSchema;
+ // the input split mapper handles does not belong to this table
+ // it is necessary to ensure projectedSchema equals to tableSchema,
+ // or we cannot find selectOperator's column from inspector
+ if (projectedSchema.columns().size() != distinctSelectedColumns.length) {
+ projectedSchema = tableSchema;
+ }
Review comment:
Looks good generally, but I wanted to clarify this comment:
` // the input split mapper handles does not belong to this table
// it is necessary to ensure projectedSchema equals to tableSchema,
// or we cannot find selectOperator's column from inspector
`
Just for my understanding, can you give an example in what scenario we could
face this issue where the Schema.select() gives back a different number of
columns?
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