Support CREATE [SNAPSHOT] TABLE ... CLONE

BigQuery snapshots and clones a table with
CREATE [SNAPSHOT] TABLE target CLONE source [FOR SYSTEM_TIME AS OF ...].
The clone source is kept on CreateTable and rendered by both toString()
and CreateTableDeParser. SNAPSHOT itself already parsed as a create
option.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01EqinwHBKuAtPEmtXr3b5P2

Author: hayssams

src/main/java/net/sf/jsqlparser/statement/create/table/CreateTable.java

@@ -36,6 +36,7 @@ public class CreateTable implements Statement {
     private List<TableElement> tableElements;
     private Select select;
     private Table likeTable;
+    private Table cloneTable;
     private ColDataType ofType;
     private boolean selectParenthesis;
     private boolean ifNotExists = false;
@@ -236,6 +237,22 @@ public void setLikeTable(Table likeTable, boolean parenthesis) {
         this.selectParenthesis = parenthesis;
     }
 
+    /**
+     * BigQuery's {@code CREATE [SNAPSHOT] TABLE target CLONE source [FOR SYSTEM_TIME AS OF ...]}.
+     */
+    public Table getCloneTable() {
+        return cloneTable;
+    }
+
+    public void setCloneTable(Table cloneTable) {
+        this.cloneTable = cloneTable;
+    }
+
+    public CreateTable withCloneTable(Table cloneTable) {
+        setCloneTable(cloneTable);
+        return this;
+    }
+
     public boolean isIfNotExists() {
         return ifNotExists;
     }
@@ -330,6 +347,9 @@ private void appendCreateClause(StringBuilder b) {
         if (partitionOf != null) {
             b.append(" PARTITION OF ").append(partitionOf);
         }
+        if (cloneTable != null) {
+            b.append(" CLONE ").append(cloneTable);
+        }
     }
 
     private void appendColumnDefinitions(StringBuilder b) {

src/main/java/net/sf/jsqlparser/util/deparser/CreateTableDeParser.java

@@ -62,6 +62,9 @@ public void deParse(CreateTable createTable) {
             builder.append(" PARTITION OF ")
                     .append(createTable.getPartitionOf().getFullyQualifiedName());
         }
+        if (createTable.getCloneTable() != null) {
+            builder.append(" CLONE ").append(createTable.getCloneTable());
+        }
 
         if (createTable.getColumns() != null && !createTable.getColumns().isEmpty()) {
             builder.append(" (");

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

@@ -1975,6 +1975,7 @@ String NonReservedWord() :
       | tk=<K_CLOSE:"CLOSE">
       | tk=<K_CLOUD:"CLOUD">
       | tk=<K_COALESCE:"COALESCE">
+      | tk=<K_CLONE: "CLONE">
       | tk=<K_COLLATE:"COLLATE">
       | tk=<K_COLUMN:"COLUMN">
       | tk=<K_COLUMNS:"COLUMNS">
@@ -13556,6 +13557,12 @@ CreateTable CreateTable(boolean isUsingOrReplace):
     <K_TABLE>
     [ LOOKAHEAD(2) <K_IF> <K_NOT> <K_EXISTS> { createTable.setIfNotExists(true); }]
     table=Table()
+    [
+        // BigQuery: CREATE [SNAPSHOT] TABLE target CLONE source [FOR SYSTEM_TIME AS OF ...]
+        LOOKAHEAD(2) <K_CLONE> likeTable=Table()
+        [ LOOKAHEAD(2) tableColumn=TimeTravelAfterAlias() { likeTable.setTimeTravel(tableColumn); } ]
+        { createTable.setCloneTable(likeTable); likeTable = null; }
+    ]
     [ <K_OF> ofType=ColDataType() { createTable.setOfType(ofType); } ]
     [ LOOKAHEAD(2) <K_PARTITION> <K_OF> partitionOfTable=Table()
         { createTable.setPartitionOf(partitionOfTable); } ]

src/test/java/net/sf/jsqlparser/statement/select/BigQueryTest.java

@@ -315,4 +315,32 @@ void testLoadDataTablesNamesFinder() throws JSQLParserException {
                 new net.sf.jsqlparser.util.TablesNamesFinder<Void>()
                         .getTableList(net.sf.jsqlparser.parser.CCJSqlParserUtil.parse(sqlStr)));
     }
+
+    @Test
+    void testCreateSnapshotTableClone() throws JSQLParserException {
+        String sqlStr = "CREATE SNAPSHOT TABLE ds.snap CLONE ds.t";
+        CreateTable createTable =
+                (CreateTable) TestUtils.assertSqlCanBeParsedAndDeparsed(sqlStr, true);
+
+        Assertions.assertEquals("ds.t", createTable.getCloneTable().getFullyQualifiedName());
+    }
+
+    @Test
+    void testCreateSnapshotTableCloneForSystemTimeAsOf() throws JSQLParserException {
+        String sqlStr = "CREATE SNAPSHOT TABLE IF NOT EXISTS ds.snap CLONE ds.t "
+                + "FOR SYSTEM_TIME AS OF CURRENT_TIMESTAMP()";
+        TestUtils.assertSqlCanBeParsedAndDeparsed(sqlStr, true);
+    }
+
+    @Test
+    void testCreateTableCloneWithOptions() throws JSQLParserException {
+        String sqlStr = "CREATE TABLE ds.copy CLONE ds.t OPTIONS (description = 'x')";
+        TestUtils.assertSqlCanBeParsedAndDeparsed(sqlStr, true);
+    }
+
+    @Test
+    void testCloneRemainsUsableAsIdentifier() throws JSQLParserException {
+        String sqlStr = "SELECT clone FROM t";
+        TestUtils.assertSqlCanBeParsedAndDeparsed(sqlStr, true);
+    }
 }