[SPARK-21832][TEST] Merge SQLBuilderTest into ExpressionSQLBuilderSuite

## What changes were proposed in this pull request?

After [SPARK-19025](apache#16869), there is no need to keep SQLBuilderTest.
ExpressionSQLBuilderSuite is the only place to use it.
This PR aims to remove SQLBuilderTest.

## How was this patch tested?

Pass the updated `ExpressionSQLBuilderSuite`.

Author: Dongjoon Hyun <[email protected]>

Closes apache#19044 from dongjoon-hyun/SPARK-21832.

Author: dongjoon-hyun

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

@@ -19,12 +19,29 @@ package org.apache.spark.sql.catalyst
 
 import java.sql.Timestamp
 
+import org.apache.spark.sql.QueryTest
 import org.apache.spark.sql.catalyst.dsl.expressions._
-import org.apache.spark.sql.catalyst.expressions.{If, Literal, SpecifiedWindowFrame, TimeAdd,
-  TimeSub, WindowSpecDefinition}
+import org.apache.spark.sql.catalyst.expressions._
+import org.apache.spark.sql.hive.test.TestHiveSingleton
 import org.apache.spark.unsafe.types.CalendarInterval
 
-class ExpressionSQLBuilderSuite extends SQLBuilderTest {
+class ExpressionSQLBuilderSuite extends QueryTest with TestHiveSingleton {
+  protected def checkSQL(e: Expression, expectedSQL: String): Unit = {
+    val actualSQL = e.sql
+    try {
+      assert(actualSQL == expectedSQL)
+    } catch {
+      case cause: Throwable =>
+        fail(
+          s"""Wrong SQL generated for the following expression:
+             |
+             |${e.prettyName}
+             |
+             |$cause
+           """.stripMargin)
+    }
+  }
+
   test("literal") {
     checkSQL(Literal("foo"), "'foo'")
     checkSQL(Literal("\"foo\""), "'\"foo\"'")