Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/19811#discussion_r157407681
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/codegen/CodeGenerator.scala
---
@@ -163,11 +204,51 @@ class CodegenContext {
* the list of default imports available.
* Also, generic type arguments are accepted but ignored.
* @param variableName Name of the field.
- * @param initCode The statement(s) to put into the init() method to
initialize this field.
+ * @param initFunc Function includes statement(s) to put into the init()
method to initialize
+ * this field. The argument is the name of the mutable
state variable.
* If left blank, the field will be default-initialized.
+ * @param forceInline whether the declaration and initialization code
may be inlined rather than
+ * compacted. Please set `true` into forceInline, if
you want to access the
+ * status fast (e.g. frequently accessed) or if you
want to use the original
+ * variable name
+ * @param useFreshName If this is false and forceInline is true, the
name is not changed
--- End diff --
more accurate: `If this is false and mutable state ends up inlining in the
outer class, the name is not changed`
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