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ql/src/java/org/apache/hadoop/hive/ql/io/parquet/serde/AbstractParquetMapInspector.java <https://reviews.apache.org/r/18925/#comment67584> I don't think we should check the class equality here. A child class might inherit a parent class w/o any new identifier. In that case the child class can still be equal to the parent class. It's really up to the child class to decide the equality (by overriding the equal()). ql/src/java/org/apache/hadoop/hive/ql/io/parquet/serde/AbstractParquetMapInspector.java <https://reviews.apache.org/r/18925/#comment67585> 1. code style: we may need {} for else if block 2. However, I think this might be refactored as follows for easier understanding: boolean keyEq = (keyInspector == null && other.keyInspector == null) || keyInspector.equal(other.keyInspector); boolean valEq = (ValueInspector == null && other.valueInspector == null) || valueInspector.equal(other.valueInspector); return keyEq && valEq; - Xuefu Zhang On March 7, 2014, 10:20 p.m., Szehon Ho wrote: > > ----------------------------------------------------------- > This is an automatically generated e-mail. To reply, visit: > https://reviews.apache.org/r/18925/ > ----------------------------------------------------------- > > (Updated March 7, 2014, 10:20 p.m.) > > > Review request for hive, Brock Noland, justin coffey, and Xuefu Zhang. > > > Repository: hive-git > > > Description > ------- > > The issue is, as part of select * query, a DeepParquetHiveMapInspector is > used for one column of an overall parquet-table struct object inspector. > > The problem lies in the ObjectInspectorFactory's cache for struct object > inspector. For performance, there is a cache keyed on an array list, of all > object inspectors of columns. The second time the query is run, it attempts > to lookup cached struct inspector. But when the hashmap looks up the part of > the key consisting of the DeepParquetHiveMapInspector, java calls .equals > against the existing DeepParquetHivemapInspector. This fails, as the .equals > method casted the "other" to a "StandardParquetHiveInspector". > > Regenerating the .equals and .hashcode from eclipse. > > Also adding one more check in .equals before casting, to handle the case if > another class of object inspector gets hashed to the same hashcode in the > cache. Then java would call .equals against the other, which in this case is > not of the same class. > > > Diffs > ----- > > > ql/src/java/org/apache/hadoop/hive/ql/io/parquet/serde/AbstractParquetMapInspector.java > 1d72747 > > Diff: https://reviews.apache.org/r/18925/diff/ > > > Testing > ------- > > Manual testing. > > > Thanks, > > Szehon Ho > >
