diff --git a/docs/sql-ref-ansi-compliance.md b/docs/sql-ref-ansi-compliance.md
index f083f880cc..e786c0bc9a 100644
--- a/docs/sql-ref-ansi-compliance.md
+++ b/docs/sql-ref-ansi-compliance.md
@@ -264,7 +264,7 @@ Below is a list of all the keywords in Spark SQL.
 |MAP|non-reserved|non-reserved|non-reserved|
 |MATCHED|non-reserved|non-reserved|non-reserved|
 |MERGE|non-reserved|non-reserved|non-reserved|
-|MINUS|not-reserved|strict-non-reserved|non-reserved|
+|MINUS|non-reserved|strict-non-reserved|non-reserved|
 |MINUTE|reserved|non-reserved|reserved|
 |MONTH|reserved|non-reserved|reserved|
 |MSCK|non-reserved|non-reserved|non-reserved|
diff --git a/sql/catalyst/src/main/antlr4/org/apache/spark/sql/catalyst/parser/SqlBase.g4 b/sql/catalyst/src/main/antlr4/org/apache/spark/sql/catalyst/parser/SqlBase.g4
index 73dfdcc263..b9c46616ca 100644
--- a/sql/catalyst/src/main/antlr4/org/apache/spark/sql/catalyst/parser/SqlBase.g4
+++ b/sql/catalyst/src/main/antlr4/org/apache/spark/sql/catalyst/parser/SqlBase.g4
@@ -1226,6 +1226,7 @@ strictNonReserved
     ;
 
 nonReserved
+//--DEFAULT-NON-RESERVED-START
     : ADD
     | AFTER
     | ALL
@@ -1466,6 +1467,7 @@ nonReserved
     | WITH
     | YEAR
     | ZONE
+//--DEFAULT-NON-RESERVED-END
     ;
 
 // NOTE: If you add a new token in the list below, you should update the list of keywords
diff --git a/sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/SQLKeywordSuite.scala b/sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/SQLKeywordSuite.scala
index 3d41d02b23..082b01173e 100644
--- a/sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/SQLKeywordSuite.scala
+++ b/sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/SQLKeywordSuite.scala
@@ -38,7 +38,7 @@ trait SQLKeywordUtils extends SQLHelper {
   }
 
   // each element is an array of 4 string: the keyword name, reserve or not in Spark ANSI mode,
-  // Spark non-ANSI mode, and the SQL standard.
+  // Spark default mode, and the SQL standard.
   val keywordsInDoc: Array[Array[String]] = {
     val docPath = {
       java.nio.file.Paths.get(sparkHome, "docs", "sql-ref-ansi-compliance.md").toFile
@@ -135,6 +135,19 @@ trait SQLKeywordUtils extends SQLHelper {
   }
 
   val reservedKeywordsInAnsiMode = allCandidateKeywords -- nonReservedKeywordsInAnsiMode
+
+  val nonReservedKeywordsInDefaultMode: Set[String] = {
+    val kwDef = """\s*[\|:]\s*([A-Z_]+)\s*""".r
+    parseAntlrGrammars("//--DEFAULT-NON-RESERVED-START", "//--DEFAULT-NON-RESERVED-END") {
+      // Parses a pattern, e.g., `    | AFTER`
+      case kwDef(symbol) =>
+        if (symbolsToExpandIntoDifferentLiterals.contains(symbol)) {
+          symbolsToExpandIntoDifferentLiterals(symbol)
+        } else {
+          symbol :: Nil
+        }
+    }
+  }
 }
 
 class SQLKeywordSuite extends SparkFunSuite with SQLKeywordUtils {
@@ -146,11 +159,32 @@ class SQLKeywordSuite extends SparkFunSuite with SQLKeywordUtils {
     }
   }
 
-  test("Spark keywords are documented correctly") {
-    val reservedKeywordsInDoc = keywordsInDoc.filter(_.apply(1) == "reserved").map(_.head).toSet
-    if (reservedKeywordsInAnsiMode != reservedKeywordsInDoc) {
-      val misImplemented = (reservedKeywordsInDoc -- reservedKeywordsInAnsiMode).toSeq.sorted
-      fail("Some keywords are documented as reserved but actually not: " +
+  test("Spark keywords are documented correctly under ANSI mode") {
+    // keywords under ANSI mode should either be reserved or non-reserved.
+    keywordsInDoc.map(_.apply(1)).foreach { desc =>
+      assert(desc == "reserved" || desc == "non-reserved")
+    }
+
+    val nonReservedInDoc = keywordsInDoc.filter(_.apply(1) == "non-reserved").map(_.head).toSet
+    if (nonReservedKeywordsInAnsiMode != nonReservedInDoc) {
+      val misImplemented = ((nonReservedInDoc -- nonReservedKeywordsInAnsiMode) ++
+        (nonReservedKeywordsInAnsiMode -- nonReservedInDoc)).toSeq.sorted
+      fail("Some keywords are documented and implemented inconsistently: " +
+        misImplemented.mkString(", "))
+    }
+  }
+
+  test("Spark keywords are documented correctly under default mode") {
+    // keywords under default mode should either be strict-non-reserved or non-reserved.
+    keywordsInDoc.map(_.apply(2)).foreach { desc =>
+      assert(desc == "strict-non-reserved" || desc == "non-reserved")
+    }
+
+    val nonReservedInDoc = keywordsInDoc.filter(_.apply(2) == "non-reserved").map(_.head).toSet
+    if (nonReservedKeywordsInDefaultMode != nonReservedInDoc) {
+      val misImplemented = ((nonReservedInDoc -- nonReservedKeywordsInDefaultMode) ++
+        (nonReservedKeywordsInDefaultMode -- nonReservedInDoc)).toSeq.sorted
+      fail("Some keywords are documented and implemented inconsistently: " +
         misImplemented.mkString(", "))
     }
   }