fix: preserve token boundaries in DDL parameter lists (#2857)

Author: minleejae

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

@@ -19822,14 +19822,23 @@ String AList():
     StringBuilder retval = new StringBuilder("(");
     Token tk = null;
     String name = null;
+    boolean needsSeparator = false;
 }
 {
      "("
 
      (
-       ( (tk=<S_LONG> | tk=<S_DOUBLE> | tk=<S_CHAR_LITERAL> | tk=<K_TRUE> | tk=<K_FALSE>) { retval.append(tk.image); }
-         | (name=RelObjectName()) { retval.append(name); })
-       [("," {retval.append(",");} | "=" {retval.append("=");})] )*
+       ( (tk=<S_LONG> | tk=<S_DOUBLE> | tk=<S_CHAR_LITERAL> | tk=<K_TRUE> | tk=<K_FALSE>) { name = tk.image; }
+         | name=RelObjectName() )
+       {
+           if (needsSeparator) {
+               retval.append(' ');
+           }
+           retval.append(name);
+           needsSeparator = true;
+       }
+       [("," { retval.append(','); needsSeparator = false; }
+         | "=" { retval.append('='); needsSeparator = false; })] )*
 
     ")"
     {

src/test/java/net/sf/jsqlparser/statement/create/DdlParameterListTest.java

@@ -0,0 +1,57 @@
+/*-
+ * #%L
+ * JSQLParser library
+ * %%
+ * Copyright (C) 2004 - 2026 JSQLParser
+ * %%
+ * Dual licensed under GNU LGPL 2.1 or Apache License 2.0
+ * #L%
+ */
+package net.sf.jsqlparser.statement.create;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import net.sf.jsqlparser.JSQLParserException;
+import net.sf.jsqlparser.parser.AbstractJSqlParser.Dialect;
+import net.sf.jsqlparser.parser.CCJSqlParser;
+import net.sf.jsqlparser.parser.CCJSqlParserConstants;
+import net.sf.jsqlparser.parser.CCJSqlParserUtil;
+import net.sf.jsqlparser.parser.ParseException;
+import net.sf.jsqlparser.statement.Statement;
+import net.sf.jsqlparser.util.deparser.StatementDeParser;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.ValueSource;
+
+class DdlParameterListTest {
+    @ParameterizedTest
+    @ValueSource(strings = {
+            "CREATE VECTOR INDEX items_hnsw ON items (embedding) ORGANIZATION INMEMORY NEIGHBOR GRAPH DISTANCE COSINE WITH TARGET ACCURACY 95 PARAMETERS (TYPE HNSW,NEIGHBORS 32,EFCONSTRUCTION 500)",
+            "CREATE VECTOR INDEX items_ivf ON items (embedding) ORGANIZATION NEIGHBOR PARTITIONS DISTANCE COSINE WITH TARGET ACCURACY 95 PARAMETERS (TYPE IVF,NEIGHBOR PARTITIONS 10)",
+            "CREATE TABLE samples (id INT) STORAGE (INITIAL 65536,NEXT 131072)"})
+    void ddlParametersKeepSeparateWordsAndNumbers(String sql) throws JSQLParserException {
+        for (Dialect dialect : new Dialect[] {null, Dialect.ORACLE}) {
+            Statement statement = CCJSqlParserUtil.parse(sql, parser -> {
+                if (dialect != null) {
+                    parser.withDialect(dialect);
+                }
+            });
+            assertEquals(sql, statement.toString());
+            StringBuilder output = new StringBuilder();
+            statement.accept(new StatementDeParser(output), null);
+            assertEquals(sql, output.toString());
+            assertEquals(sql, CCJSqlParserUtil.parse(output.toString()).toString());
+        }
+    }
+
+    @ParameterizedTest
+    @ValueSource(strings = {"()", "(1,2,3)", "(name=value,count=32)",
+            "(TYPE HNSW,NEIGHBORS 32,EFCONSTRUCTION 500)",
+            "(enabled TRUE,ratio 0.5,disabled FALSE)",
+            "('keep  two spaces','comma,equals=','it''s fine')",
+            "(\"Quoted Name\" 10,\"dotted.name\" 20)"})
+    void preservesLiteralsQuotedNamesAndExplicitDelimiters(String list) throws ParseException {
+        CCJSqlParser parser = CCJSqlParserUtil.newParser(list);
+        assertEquals(list, parser.AList());
+        assertEquals(CCJSqlParserConstants.EOF, parser.getNextToken().kind);
+    }
+}