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https://issues.apache.org/jira/browse/SPARK-28732?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16908706#comment-16908706
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Hyukjin Kwon commented on SPARK-28732:
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[~ametivier], please provide self-contained reproducer.
> org.apache.spark.sql.catalyst.expressions.codegen.CodeGenerator - failed to
> compile: org.codehaus.commons.compiler.CompileException: File
> 'generated.java' when storing the result of a count aggregation in an integer
> -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: SPARK-28732
> URL: https://issues.apache.org/jira/browse/SPARK-28732
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.1.0, 2.2.0, 2.3.0, 2.4.0
> Reporter: Alix Métivier
> Priority: Major
>
> I am using agg function on a dataset, and i want to count the number of lines
> upon grouping columns. I would like to store the result of this count in an
> integer, but it fails with this output :
> {code}
> [ERROR]: org.apache.spark.sql.catalyst.expressions.codegen.CodeGenerator -
> failed to compile: org.codehaus.commons.compiler.CompileException: File
> 'generated.java', Line 89, Column 53: No applicable constructor/method found
> for actual parameters "long"; candidates are: "java.lang.Integer(int)",
> "java.lang.Integer(java.lang.String)"
> Here is the line 89 and a few others to understand :
> /* 085 */ long value13 = i.getLong(5);
> /* 086 */ argValue4 = value13;
> /* 087 */
> /* 088 */
> /* 089 */ final java.lang.Integer value12 = false ? null : new
> java.lang.Integer(argValue4);
> {code}
>
> As per Integer documentation, there is not constructor for the type Long, so
> this is why the generated code fails.
> Here is my code :
> {code}
> org.apache.spark.sql.Dataset<row2Struct> ds_row2 =
> ds_conntAggregateRow_1_Out_1
> .groupBy(org.apache.spark.sql.functions.col("n_name").as("n_nameN"),
> org.apache.spark.sql.functions.col("o_year").as("o_yearN"))
> .agg(org.apache.spark.sql.functions.count("n_name").as("countN"),
> .as(org.apache.spark.sql.Encoders.bean(row2Struct.class));
> {code}
> row2Struct class is composed of n_nameN: String, o_yearN: String, countN: Int
> If countN is a Long, code above wont fail
> If it is an Int, it works in 1.6 and 2.0, but fails on version 2.1+
>
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