Add CTAS (CREATE TABLE AS SELECT) statement parsing support

- Add SelectStatement and CtasColumns fields to CreateTableStatement
- Add TableDistributionPolicy interface with HASH, ROUND_ROBIN, REPLICATE policies
- Add CLUSTERED COLUMNSTORE INDEX ORDER() parsing for ordered CCI
- Add DISTRIBUTION, CLUSTERED INDEX, HEAP options to parseCreateTableOptions
- Fix CTAS column list detection to use peekTok directly (avoids lexer state issues)
- Enable Baselines130_CtasStatementTests and CtasStatementTests

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: kyleconroy

ast/create_table_statement.go

@@ -12,6 +12,8 @@ type CreateTableStatement struct {
 	FileStreamOn                 *IdentifierOrValueExpression
 	Options                      []TableOption
 	FederationScheme             *FederationScheme
+	SelectStatement              *SelectStatement   // For CTAS: CREATE TABLE ... AS SELECT
+	CtasColumns                  []*Identifier      // For CTAS with column names: CREATE TABLE (col1, col2) WITH ... AS SELECT
 }
 
 // FederationScheme represents a FEDERATED ON clause

ast/table_distribution_option.go

@@ -1,8 +1,13 @@
 package ast
 
+// TableDistributionPolicy is an interface for table distribution policies
+type TableDistributionPolicy interface {
+	tableDistributionPolicy()
+}
+
 // TableDistributionOption represents DISTRIBUTION option for tables
 type TableDistributionOption struct {
-	Value      *TableHashDistributionPolicy
+	Value      TableDistributionPolicy
 	OptionKind string // "Distribution"
 }
 
@@ -15,4 +20,17 @@ type TableHashDistributionPolicy struct {
 	DistributionColumns []*Identifier
 }
 
-func (t *TableHashDistributionPolicy) node() {}
+func (t *TableHashDistributionPolicy) node()                    {}
+func (t *TableHashDistributionPolicy) tableDistributionPolicy() {}
+
+// TableRoundRobinDistributionPolicy represents ROUND_ROBIN distribution for tables
+type TableRoundRobinDistributionPolicy struct{}
+
+func (t *TableRoundRobinDistributionPolicy) node()                    {}
+func (t *TableRoundRobinDistributionPolicy) tableDistributionPolicy() {}
+
+// TableReplicateDistributionPolicy represents REPLICATE distribution for tables
+type TableReplicateDistributionPolicy struct{}
+
+func (t *TableReplicateDistributionPolicy) node()                    {}
+func (t *TableReplicateDistributionPolicy) tableDistributionPolicy() {}

ast/table_index_option.go

@@ -17,8 +17,9 @@ type TableIndexType interface {
 
 // TableClusteredIndexType represents a clustered index type
 type TableClusteredIndexType struct {
-	Columns     []*ColumnWithSortOrder
-	ColumnStore bool
+	Columns        []*ColumnWithSortOrder
+	ColumnStore    bool
+	OrderedColumns []*ColumnReferenceExpression // For COLUMNSTORE INDEX ORDER(columns)
 }
 
 func (t *TableClusteredIndexType) node()           {}