yaooqinn opened a new pull request #30045:
URL: https://github.com/apache/spark/pull/30045
### What changes were proposed in this pull request?
#### case
the case here covers the static and dynamic SQL configs behavior in
`sharedState` and `sessionState`, and the specially handled config
`spark.sql.warehouse.dir`
```scala
import java.lang.reflect.Field
import org.apache.spark.sql.SparkSession
import org.apache.spark.{SparkConf, SparkContext}
object WarehouseSCBeforeSS extends App {
val wh = "spark.sql.warehouse.dir"
val td = "spark.sql.globalTempDatabase"
val custom = "spark.sql.custom"
val conf = new SparkConf()
.setMaster("local")
.setAppName("SPARK-32991")
.set(wh, "./data1")
.set(td, "bob")
val sc = new SparkContext(conf)
val spark = SparkSession.builder()
.config(wh, "./data2")
.config(td, "alice")
.config(custom, "kyao")
.getOrCreate()
val confField: Field = spark.sharedState.getClass.getDeclaredField("conf")
confField.setAccessible(true)
private val shared: SparkConf =
confField.get(spark.sharedState).asInstanceOf[SparkConf]
println()
println(s"=====> SharedState: $wh=${shared.get(wh)}")
println(s"=====> SharedState: $td=${shared.get(td)}")
println(s"=====> SharedState: $custom=${shared.get(custom, "")}")
println(s"=====> SessionState: $wh=${spark.conf.get(wh)}")
println(s"=====> SessionState: $td=${spark.conf.get(td)}")
println(s"=====> SessionState: $custom=${spark.conf.get(custom, "")}")
val spark2 = SparkSession.builder().config(td, "fred").getOrCreate()
println(s"=====> SessionState 2: $wh=${spark2.conf.get(wh)}")
println(s"=====> SessionState 2: $td=${spark2.conf.get(td)}")
println(s"=====> SessionState 2: $custom=${spark2.conf.get(custom, "")}")
SparkSession.setActiveSession(spark)
spark.sql("RESET")
println(s"=====> SessionState RESET: $wh=${spark.conf.get(wh)}")
println(s"=====> SessionState RESET: $td=${spark.conf.get(td)}")
println(s"=====> SessionState RESET: $custom=${spark.conf.get(custom,
"")}")
val spark3 = SparkSession.builder().getOrCreate()
println(s"=====> SessionState 3: $wh=${spark2.conf.get(wh)}")
println(s"=====> SessionState 3: $td=${spark2.conf.get(td)}")
println(s"=====> SessionState 3: $custom=${spark2.conf.get(custom, "")}")
}
```
#### outputs and analysis
```
// 1. Make the cloned spark conf in shared state respect the warehouse dir
from the 1st SparkSession
//=====> SharedState: spark.sql.warehouse.dir=./data1
// 2. ⏬
//=====> SharedState: spark.sql.globalTempDatabase=alice
//=====> SharedState: spark.sql.custom=kyao
//=====> SessionState: spark.sql.warehouse.dir=./data2
//=====> SessionState: spark.sql.globalTempDatabase=alice
//=====> SessionState: spark.sql.custom=kyao
//=====> SessionState 2: spark.sql.warehouse.dir=./data2
//=====> SessionState 2: spark.sql.globalTempDatabase=alice
//=====> SessionState 2: spark.sql.custom=kyao
// 2'.🔼 OK until here
// 3. Make the below 3 ones respect the cloned spark conf in shared state
with issue 1 fixed
//=====> SessionState RESET: spark.sql.warehouse.dir=./data1
//=====> SessionState RESET: spark.sql.globalTempDatabase=bob
//=====> SessionState RESET: spark.sql.custom=
// 4. Then the SparkSessions created after RESET will be corrected.
//=====> SessionState 3: spark.sql.warehouse.dir=./data1
//=====> SessionState 3: spark.sql.globalTempDatabase=bob
//=====> SessionState 3: spark.sql.custom=
```
In this PR, we gather all valid config to the cloned conf of `sharedState`
during being constructed, well, actually only `spark.sql.warehouse.dir` is
missing. Then we use this conf as defaults for `RESET` Command.
`SparkSession.clearActiveSession/clearDefaultSession` will make the shared
state invisible and unsharable. They will be internal only soon (confirmed with
Wenchen), so cases with them called will not be a problem.
### Why are the changes needed?
<!--
Please clarify why the changes are needed. For instance,
1. If you propose a new API, clarify the use case for a new API.
2. If you fix a bug, you can clarify why it is a bug.
-->
bugfix for programming API to call RESET while users creating SparkContext
first and config SparkSession later.
### Does this PR introduce _any_ user-facing change?
<!--
Note that it means *any* user-facing change including all aspects such as
the documentation fix.
If yes, please clarify the previous behavior and the change this PR proposes
- provide the console output, description and/or an example to show the
behavior difference if possible.
If possible, please also clarify if this is a user-facing change compared to
the released Spark versions or within the unreleased branches such as master.
If no, write 'No'.
-->
yes, before this change when you use programming API and call RESET, all
configs will be reset to SparkContext.conf, now they go to
SparkSession.sharedState.conf
### How was this patch tested?
<!--
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test cases that check the changes thoroughly including negative and positive
cases if possible.
If it was tested in a way different from regular unit tests, please clarify
how you tested step by step, ideally copy and paste-able, so that other
reviewers can test and check, and descendants can verify in the future.
If tests were not added, please describe why they were not added and/or why
it was difficult to add.
-->
new tests
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