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https://issues.apache.org/jira/browse/SPARK-58484?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated SPARK-58484:
-----------------------------------
Labels: pull-request-available (was: )
> CSV scan fails with ArrayIndexOutOfBoundsException when a pushed filter has
> no column references and the required schema is empty
> ---------------------------------------------------------------------------------------------------------------------------------
>
> Key: SPARK-58484
> URL: https://issues.apache.org/jira/browse/SPARK-58484
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 4.0.0
> Reporter: Josh Rosen
> Priority: Major
> Labels: pull-request-available
>
> The query
> {code:java}
> CREATE TABLE m(c0 INT) USING CSV;
> INSERT INTO m VALUES (1);
> SELECT COUNT(*) FROM m WHERE (SELECT BOOL_OR(true) FROM m);{code}
> crashes at execution time with
> {code:java}
> java.lang.ArrayIndexOutOfBoundsException: Index 0 out of bounds for length 0
> at
> org.apache.spark.sql.catalyst.OrderedFilters.$anonfun$predicates$3(OrderedFilters.scala:63)
> at
> org.apache.spark.sql.catalyst.OrderedFilters.$anonfun$predicates$3$adapted(OrderedFilters.scala:50)
> at scala.collection.immutable.List.foreach(List.scala:323)
> at
> org.apache.spark.sql.catalyst.OrderedFilters.<init>(OrderedFilters.scala:50)
> at
> org.apache.spark.sql.catalyst.csv.UnivocityParser.<init>(UnivocityParser.scala:119)
> [...]{code}
> The WHERE clause is an uncorrelated boolean scalar subquery referencing no
> columns.
> Since SPARK-43402 such predicates are retained as data filters; at execution
> time the finished subquery is substituted as {{Literal(true)}} and translated
> to {{sources.AlwaysTrue}} , which is a filter with no references.
> With {{COUNT(*)}} the required schema is empty.
> {{OrderedFilters}} sizes its predicate-group arrays by
> {{requiredSchema.fields.length}} (which is 0 in this case) but assigns
> reference-free filters to index 0, so {{groupedFilters(0)}} throws. The
> reordering step [immediately
> below|https://github.com/apache/spark/blob/4dcdd4dba544210898180a410b8b30e0b85157cb/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/OrderedFilters.scala#L65]
> already guards {{{}len > 0{}}}; the assignment loop does not.
> {{JsonFilters}} handles the same input by mapping reference-free filters over
> the (empty) field-name set, which is why JSON does not crash on a similar
> query.
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