Github user gengliangwang commented on a diff in the pull request:
https://github.com/apache/spark/pull/22847#discussion_r228600757
--- 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 maximum source code length of a single Java function by
codegen. When the " +
+ "generated Java function source code exceeds this threshold, it will
be split into " +
+ "multiple small functions, each function length is
spark.sql.codegen.methodSplitThreshold." +
+ " A function's bytecode should not go beyond 8KB, otherwise it will
not be JITted, should " +
+ "also not be too small, or we will have many function calls. We
can't know how many " +
--- End diff --
it will not be JITted; it also should not not be too small, otherwise there
will be many function calls.
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