fix index out of bounds

Author: matriv

x-pack/plugin/sql/src/main/java/org/elasticsearch/xpack/sql/util/DateUtils.java

@@ -111,7 +111,8 @@ public static ZonedDateTime asDateTime(String dateFormat) {
 
     public static ZonedDateTime ofEscapedLiteral(String dateFormat) {
         int separatorIdx = dateFormat.lastIndexOf('-') + 3;
-        if (dateFormat.charAt(separatorIdx) == 'T') {
+        // Avoid index out of bounds - it will lead to DateTimeParseException anyways
+        if (separatorIdx >= dateFormat.length() || dateFormat.charAt(separatorIdx) == 'T') {
             return ZonedDateTime.parse(dateFormat, DATE_TIME_ESCAPED_LITERAL_FORMATTER_T_LITERAL.withZone(UTC));
         } else {
             return ZonedDateTime.parse(dateFormat, DATE_TIME_ESCAPED_LITERAL_FORMATTER_WHITESPACE.withZone(UTC));

x-pack/plugin/sql/src/test/java/org/elasticsearch/xpack/sql/parser/EscapedFunctionsTests.java

@@ -250,14 +250,21 @@ public void testTimestampLiteral() {
     }
 
     public void testTimestampLiteralValidation() {
-        ParsingException ex = expectThrows(ParsingException.class, () -> timestampLiteral("2012-01-01_AB 10:01:02.3456"));
+        String date = buildDate();
+        ParsingException ex = expectThrows(ParsingException.class, () -> timestampLiteral(date+ "_AB 10:01:02.3456"));
         assertEquals(
-                "line 1:2: Invalid timestamp received; Text '2012-01-01_AB 10:01:02.3456' could not be parsed at index 10",
+                "line 1:2: Invalid timestamp received; Text '" + date + "_AB 10:01:02.3456' could not be parsed at index " +
+                        date.length(),
                 ex.getMessage());
         ex = expectThrows(ParsingException.class, () -> timestampLiteral("20120101_AB 10:01:02.3456"));
         assertEquals(
                 "line 1:2: Invalid timestamp received; Text '20120101_AB 10:01:02.3456' could not be parsed at index 0",
                 ex.getMessage());
+
+        ex = expectThrows(ParsingException.class, () -> timestampLiteral(date));
+        assertEquals(
+                "line 1:2: Invalid timestamp received; Text '" + date + "' could not be parsed at index " + date.length(),
+                ex.getMessage());
     }
 
     public void testGUID() {