[MINOR][SQL] Use resource path for test_script.sh

## What changes were proposed in this pull request?
This PR modified the test case `test("script")` to use resource path for `test_script.sh`. Make the test case portable (even in IntelliJ).

## How was this patch tested?
Passed the test case.
Before:
Run `test("script")` in IntelliJ:
```
Caused by: org.apache.spark.SparkException: Subprocess exited with status 127. Error: bash: src/test/resources/test_script.sh: No such file or directory
```
After:
Test passed.

Author: Weiqing Yang <yangweiqing001@gmail.com>

Closes apache#15246 from weiqingy/hivetest.

core/src/test/scala/org/apache/spark/SparkFunSuite.scala

@@ -18,6 +18,8 @@
 package org.apache.spark
 
 // scalastyle:off
+import java.io.File
+
 import org.scalatest.{BeforeAndAfterAll, FunSuite, Outcome}
 
 import org.apache.spark.internal.Logging
@@ -41,6 +43,15 @@ abstract class SparkFunSuite
     }
   }
 
+  // helper function
+  protected final def getTestResourceFile(file: String): File = {
+    new File(getClass.getClassLoader.getResource(file).getFile)
+  }
+
+  protected final def getTestResourcePath(file: String): String = {
+    getTestResourceFile(file).getCanonicalPath
+  }
+
   /**
    * Log the suite name and the test name before and after each test.
    *

core/src/test/scala/org/apache/spark/deploy/history/HistoryServerSuite.scala

@@ -59,16 +59,16 @@ class HistoryServerSuite extends SparkFunSuite with BeforeAndAfter with Matchers
   with JsonTestUtils with Eventually with WebBrowser with LocalSparkContext
   with ResetSystemProperties {
 
-  private val logDir = new File("src/test/resources/spark-events")
-  private val expRoot = new File("src/test/resources/HistoryServerExpectations/")
+  private val logDir = getTestResourcePath("spark-events")
+  private val expRoot = getTestResourceFile("HistoryServerExpectations")
 
   private var provider: FsHistoryProvider = null
   private var server: HistoryServer = null
   private var port: Int = -1
 
   def init(): Unit = {
     val conf = new SparkConf()
-      .set("spark.history.fs.logDirectory", logDir.getAbsolutePath)
+      .set("spark.history.fs.logDirectory", logDir)
       .set("spark.history.fs.update.interval", "0")
       .set("spark.testing", "true")
     provider = new FsHistoryProvider(conf)

core/src/test/scala/org/apache/spark/ui/UISuite.scala

@@ -53,9 +53,10 @@ class UISuite extends SparkFunSuite {
   }
 
   private def sslEnabledConf(): (SparkConf, SSLOptions) = {
+    val keyStoreFilePath = getTestResourcePath("spark.keystore")
     val conf = new SparkConf()
       .set("spark.ssl.ui.enabled", "true")
-      .set("spark.ssl.ui.keyStore", "./src/test/resources/spark.keystore")
+      .set("spark.ssl.ui.keyStore", keyStoreFilePath)
       .set("spark.ssl.ui.keyStorePassword", "123456")
       .set("spark.ssl.ui.keyPassword", "123456")
     (conf, new SecurityManager(conf).getSSLOptions("ui"))

sql/hive/src/test/scala/org/apache/spark/sql/catalyst/LogicalPlanToSQLSuite.scala

@@ -45,7 +45,7 @@ class LogicalPlanToSQLSuite extends SQLBuilderTest with SQLTestUtils {
 
   // Used for generating new query answer files by saving
   private val regenerateGoldenFiles: Boolean = System.getenv("SPARK_GENERATE_GOLDEN_FILES") == "1"
-  private val goldenSQLPath = "src/test/resources/sqlgen/"
+  private val goldenSQLPath = getTestResourcePath("sqlgen")
 
   protected override def beforeAll(): Unit = {
     super.beforeAll()

sql/hive/src/test/scala/org/apache/spark/sql/hive/HiveSparkSubmitSuite.scala

@@ -152,7 +152,8 @@ class HiveSparkSubmitSuite
       case v if v.startsWith("2.10") || v.startsWith("2.11") => v.substring(0, 4)
       case x => throw new Exception(s"Unsupported Scala Version: $x")
     }
-    val testJar = s"sql/hive/src/test/resources/regression-test-SPARK-8489/test-$version.jar"
+    val jarDir = getTestResourcePath("regression-test-SPARK-8489")
+    val testJar = s"$jarDir/test-$version.jar"
     val args = Seq(
       "--conf", "spark.ui.enabled=false",
       "--conf", "spark.master.rest.enabled=false",

sql/hive/src/test/scala/org/apache/spark/sql/hive/execution/SQLQuerySuite.scala

@@ -66,13 +66,14 @@ class SQLQuerySuite extends QueryTest with SQLTestUtils with TestHiveSingleton {
   import spark.implicits._
 
   test("script") {
+    val scriptFilePath = getTestResourcePath("test_script.sh")
     if (testCommandAvailable("bash") && testCommandAvailable("echo | sed")) {
       val df = Seq(("x1", "y1", "z1"), ("x2", "y2", "z2")).toDF("c1", "c2", "c3")
       df.createOrReplaceTempView("script_table")
       val query1 = sql(
-        """
+        s"""
           |SELECT col1 FROM (from(SELECT c1, c2, c3 FROM script_table) tempt_table
-          |REDUCE c1, c2, c3 USING 'bash src/test/resources/test_script.sh' AS
+          |REDUCE c1, c2, c3 USING 'bash $scriptFilePath' AS
           |(col1 STRING, col2 STRING)) script_test_table""".stripMargin)
       checkAnswer(query1, Row("x1_y1") :: Row("x2_y2") :: Nil)
     }
@@ -1290,11 +1291,12 @@ class SQLQuerySuite extends QueryTest with SQLTestUtils with TestHiveSingleton {
       .selectExpr("id AS a", "id AS b")
       .createOrReplaceTempView("test")
 
+    val scriptFilePath = getTestResourcePath("data")
     checkAnswer(
       sql(
-        """FROM(
+        s"""FROM(
           |  FROM test SELECT TRANSFORM(a, b)
-          |  USING 'python src/test/resources/data/scripts/test_transform.py "\t"'
+          |  USING 'python $scriptFilePath/scripts/test_transform.py "\t"'
           |  AS (c STRING, d STRING)
           |) t
           |SELECT c
@@ -1308,12 +1310,13 @@ class SQLQuerySuite extends QueryTest with SQLTestUtils with TestHiveSingleton {
       .selectExpr("id AS a", "id AS b")
       .createOrReplaceTempView("test")
 
+    val scriptFilePath = getTestResourcePath("data")
     val df = sql(
-      """FROM test
+      s"""FROM test
         |SELECT TRANSFORM(a, b)
         |ROW FORMAT SERDE 'org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe'
         |WITH SERDEPROPERTIES('field.delim' = '|')
-        |USING 'python src/test/resources/data/scripts/test_transform.py "|"'
+        |USING 'python $scriptFilePath/scripts/test_transform.py "|"'
         |AS (c STRING, d STRING)
         |ROW FORMAT SERDE 'org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe'
         |WITH SERDEPROPERTIES('field.delim' = '|')