feat: eliminate another expensive syntactic lookahead

Signed-off-by: Andreas Reichel <andreas@manticore-projects.com>

Author: manticore-projects

README.md

@@ -76,7 +76,7 @@ This has been resolved in JSQLParser 5.3-SNAPSHOT and JMH benchmarks have been a
 
 ```text
 Benchmark                               (version)  Mode  Cnt    Score   Error  Units
-JSQLParserBenchmark.parseSQLStatements     latest  avgt   30   83.504 ± 1.557  ms/op <-- `FunctionAllColumns()` disabled
+JSQLParserBenchmark.parseSQLStatements     latest  avgt   30   78.287 ± 4.730  ms/op <-- `FunctionAllColumns()` disabled
 JSQLParserBenchmark.parseSQLStatements        5.2  avgt   30  400.876 ± 8.291  ms/op
 JSQLParserBenchmark.parseSQLStatements        5.1  avgt   30   85.731 ± 1.288  ms/op
 ```

src/main/jjtree/net/sf/jsqlparser/parser/JSqlParserCC.jjt

@@ -2438,16 +2438,12 @@ Select Select() #Select:
     Alias alias = null;
 }
 {
-    (
 
-        //@todo: avoid this expensive semantic look ahead
-        LOOKAHEAD( [ WithList() ] FromQuery()) (
-            [ with=WithList() ]
-            select = FromQuery()
-        )
+    [ with=WithList() ]
+    (
+        LOOKAHEAD(3) select = FromQuery()
         |
         (
-            [ with=WithList() ]
             (
                 LOOKAHEAD(3) select = PlainSelect()
                 |

src/site/sphinx/_static/jmh_results.txt

@@ -19,15 +19,7 @@ JSQLParserBenchmark.parseSQLStatements     latest  avgt   30   83.504 ± 1.557
 JSQLParserBenchmark.parseSQLStatements        5.2  avgt   30  400.876 ± 8.291  ms/op
 JSQLParserBenchmark.parseSQLStatements        5.1  avgt   30   85.731 ± 1.288  ms/op
 
-
 -- Token Manipulation
-Before Optimization                  (version)  Mode  Cnt  Score   Error  Units
-JSQLParserBenchmark.parseQuotedText     latest  avgt   30  0.421 ± 0.008  ms/op
-
-After Optimization                   (version)  Mode  Cnt  Score   Error  Units
-JSQLParserBenchmark.parseQuotedText     latest  avgt   30  0.366 ± 0.009  ms/op
-
-Benchmark                            (version)  Mode  Cnt  Score   Error  Units
-JSQLParserBenchmark.parseQuotedText     latest  avgt   30  0.414 ± 0.003  ms/op
-Benchmark                            (version)  Mode  Cnt  Score   Error  Units
-JSQLParserBenchmark.parseQuotedText     latest  avgt   30  0.418 ± 0.003  ms/op
+JSQLParserBenchmark.parseSQLStatements     latest  avgt   30   78.287 ±  4.730  ms/op
+JSQLParserBenchmark.parseSQLStatements        5.2  avgt   30  356.553 ± 24.823  ms/op
+JSQLParserBenchmark.parseSQLStatements        5.1  avgt   30   86.815 ±  1.771  ms/op