[ https://issues.apache.org/jira/browse/SPARK-25206?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16592390#comment-16592390 ]
yucai commented on SPARK-25206: ------------------------------- Link to SPARK-25132, this bug needs two PRs backport. > Wrong data may be returned for Parquet > -------------------------------------- > > Key: SPARK-25206 > URL: https://issues.apache.org/jira/browse/SPARK-25206 > Project: Spark > Issue Type: Bug > Components: SQL > Affects Versions: 2.2.2, 2.3.1 > Reporter: yucai > Priority: Blocker > Labels: correctness > Attachments: image-2018-08-24-18-05-23-485.png, > image-2018-08-24-22-33-03-231.png, image-2018-08-24-22-34-11-539.png, > image-2018-08-24-22-46-05-346.png, image-2018-08-25-09-54-53-219.png, > image-2018-08-25-10-04-21-901.png, pr22183.png > > > In current Spark 2.3.1, below query returns wrong data silently. > {code:java} > spark.range(10).write.parquet("/tmp/data") > sql("DROP TABLE t") > sql("CREATE TABLE t (ID LONG) USING parquet LOCATION '/tmp/data'") > scala> sql("select * from t").show > +----+ > | ID| > +----+ > |null| > |null| > |null| > |null| > |null| > |null| > |null| > |null| > |null| > |null| > +----+ > scala> sql("select * from t where id > 0").show > +---+ > | ID| > +---+ > +---+ > scala> sql("set spark.sql.parquet.filterPushdown").show > +--------------------+-----+ > | key|value| > +--------------------+-----+ > |spark.sql.parquet...| true| > +--------------------+-----+ > scala> sql("set spark.sql.parquet.filterPushdown=false").show > +--------------------+-----+ > | key|value| > +--------------------+-----+ > |spark.sql.parquet...|false| > +--------------------+-----+ > scala> sql("select * from t where id > 0").show > +---+ > | ID| > +---+ > +---+ > {code} > > *Root Cause* > Spark pushdowns FilterApi.gt(intColumn("{color:#ff0000}ID{color}"), 0: > Integer) into parquet, but {color:#ff0000}ID{color} does not exist in > /tmp/data (parquet is case sensitive, it has {color:#ff0000}id{color} > actually). > So no records are returned. > In Spark 2.1, the user will get Exception: > {code:java} > Caused by: java.lang.IllegalArgumentException: Column [ID] was not found in > schema!{code} > But in Spark 2.3, they will get the wrong results sliently. > > Since SPARK-24716, Spark uses Parquet schema instead of Hive metastore schema > to do the pushdown, perfect for this issue. > [~yumwang], [~cloud_fan], [~smilegator], any thoughts? Should we backport it? -- This message was sent by Atlassian JIRA (v7.6.3#76005) --------------------------------------------------------------------- To unsubscribe, e-mail: issues-unsubscr...@spark.apache.org For additional commands, e-mail: issues-h...@spark.apache.org