Github user kiszk commented on a diff in the pull request:
https://github.com/apache/spark/pull/22847#discussion_r229577345
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/internal/SQLConf.scala ---
@@ -812,6 +812,17 @@ object SQLConf {
.intConf
.createWithDefault(65535)
+ val CODEGEN_METHOD_SPLIT_THRESHOLD =
buildConf("spark.sql.codegen.methodSplitThreshold")
+ .internal()
+ .doc("The threshold of source code length without comment of a single
Java function by " +
+ "codegen to be split. When the generated Java function source code
exceeds this threshold" +
+ ", it will be split into multiple small functions. We can't know how
many bytecode will " +
+ "be generated, so use the code length as metric. A function's
bytecode should not go " +
+ "beyond 8KB, otherwise it will not be JITted; it also should not be
too small, otherwise " +
+ "there will be many function calls.")
+ .intConf
--- End diff --
1000 is conservative. But, there is no recommendation since the bytecode
size depends on the content (e.g. `0`'s byte code length is 1. `9`'s byte code
lengh is 2).
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