arina-ielchiieva opened a new pull request #443: Add null check in GenericRecord#get method to avoid failure when value is null URL: https://github.com/apache/incubator-iceberg/pull/443 Issue was discovered when filtering data by column with null value: ``` java.lang.IllegalStateException: Not an instance of java.lang.CharSequence: null at org.apache.iceberg.data.GenericRecord.get(GenericRecord.java:123) at org.apache.iceberg.Accessors$PositionAccessor.get(Accessors.java:57) at org.apache.iceberg.Accessors$PositionAccessor.get(Accessors.java:44) at org.apache.iceberg.expressions.BoundReference.get(BoundReference.java:49) at org.apache.iceberg.expressions.Evaluator$EvalVisitor.eq(Evaluator.java:128) at org.apache.iceberg.expressions.Evaluator$EvalVisitor.eq(Evaluator.java:58) at org.apache.iceberg.expressions.ExpressionVisitors$BoundExpressionVisitor.predicate(ExpressionVisitors.java:120) at org.apache.iceberg.expressions.ExpressionVisitors.visit(ExpressionVisitors.java:156) at org.apache.iceberg.expressions.ExpressionVisitors.visit(ExpressionVisitors.java:171) at org.apache.iceberg.expressions.ExpressionVisitors.visit(ExpressionVisitors.java:171) at org.apache.iceberg.expressions.Evaluator$EvalVisitor.eval(Evaluator.java:63) at org.apache.iceberg.expressions.Evaluator$EvalVisitor.access$000(Evaluator.java:58) at org.apache.iceberg.expressions.Evaluator.eval(Evaluator.java:55) at com.google.common.collect.Iterators$7.computeNext(Iterators.java:675) at com.google.common.collect.AbstractIterator.tryToComputeNext(AbstractIterator.java:143) at com.google.common.collect.AbstractIterator.hasNext(AbstractIterator.java:138) at org.apache.iceberg.data.TableScanIterable$ScanIterator.hasNext(TableScanIterable.java:129) ``` Since `instanceOf` check returns false when value is null, correct behavior would to be return null value instead of failing with `IllegalStateException` exception. Other classes which implement `StructLike` return null, only `GenericRecord` is failing.
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