fix maropu's comments

Author: yangjie

sql/core/src/test/scala/org/apache/spark/sql/ExpressionsSchemaSuite.scala

@@ -162,7 +162,7 @@ class ExpressionsSchemaSuite extends QueryTest with SharedSparkSession {
           s"${outputSize + headerSize}. Try regenerating the result files.")
 
       val numberOfQueries = lines(2).split(":")(1).trim.toInt
-      val numberOfMissingExample = lines(3).split(":")(1).trim.toInt
+      val numberOfMissingExamples = lines(3).split(":")(1).trim.toInt
       val missingExamples = lines(4).split(":")(1).trim.split(",")
       val expectedOutputs = Seq.tabulate(outputSize) { i =>
         val segments = lines(i + headerSize).split('|')
@@ -177,9 +177,9 @@ class ExpressionsSchemaSuite extends QueryTest with SharedSparkSession {
       assert(numberOfQueries == expectedOutputs.size,
         s"outputs size: ${expectedOutputs.size} not same as numberOfQueries: $numberOfQueries " +
           "record in result file. Try regenerating the result files.")
-      assert(numberOfMissingExample == missingExamples.size,
+      assert(numberOfMissingExamples == missingExamples.size,
         s"missing examples size: ${missingExamples.size} not same as " +
-          s"numberOfMissingExample: $numberOfMissingExample " +
+          s"numberOfMissingExample: $numberOfMissingExamples " +
           "record in result file. Try regenerating the result files.")
 
       (missingExamples, expectedOutputs)