JDBC-632 Fix case sensitivity first letter in escape clause

The commit in master contains more extensive tests

src/documentation/release_notes.md

@@ -254,6 +254,8 @@ The following has been changed or fixed since Jaybird 3.0.9:
     implementation details that might change in future versions. \
     This feature was backported from Jaybird 4.0.1.
 -   Fixed: Use of `isc_dpb_no_db_triggers` no longer logs a warning ([JDBC-628](http://tracker.firebirdsql.org/browse/JDBC-628))
+-   Fixed: First letter of JDBC escape was case-sensitive ([JDBC-632](http://tracker.firebirdsql.org/browse/JDBC-632)) \
+    This was a regression compared to 2.2.x.
 
 ### Known issues in Jaybird 3.0.10
 

src/main/org/firebirdsql/jdbc/escape/FBEscapedParser.java

@@ -410,12 +410,19 @@ protected ParserState nextState(char inputChar) throws FBSQLParseException {
                 switch (inputChar) {
                 case '?': // start of {?= call ...}
                 case 'c': // start of {call ...}
+                case 'C':
                 case 'd': // start of {d ...}
+                case 'D':
                 case 't': // start of {t ...} or {ts ...}
+                case 'T':
                 case 'e': // start of {escape ...}
+                case 'E':
                 case 'f': // start of {fn ...}
+                case 'F':
                 case 'o': // start of {oj ...}
+                case 'O':
                 case 'l': // start of {limit ...}
+                case 'L':
                     return NORMAL_STATE;
                 default:
                     throw new FBSQLParseException("Unexpected first character inside JDBC escape: " + inputChar);

src/test/org/firebirdsql/jdbc/escape/TestFBEscapedParser.java

@@ -183,6 +183,16 @@ public void testCallEscape() throws Exception {
         String parseResult = parser.parse(input);
         assertEquals("Unexpected output for {call ..}", expectedOutput, parseResult);
     }
+
+    @Test
+    public void testCallEscape_caseInsensitive() throws Exception {
+        final FBEscapedParser parser = new FBEscapedParser(EscapeParserMode.USE_BUILT_IN);
+        final String input = "{CALL FUNCTION(?,?)}";
+        final String expectedOutput = "EXECUTE PROCEDURE FUNCTION(?,?)";
+
+        String parseResult = parser.parse(input);
+        assertEquals("Unexpected output for {call ..}", expectedOutput, parseResult);
+    }
 
     @Test
     public void testQuestionmarkCallEscape() throws Exception {