Add support for standard syntax of CREATE TABLE AS query

h2/src/docsrc/help/help.csv

@@ -739,7 +739,7 @@ CREATE SEQUENCE SEQ_ID
 "Commands (DDL)","CREATE TABLE","
 CREATE [ CACHED | MEMORY ] [ TEMP | [ GLOBAL | LOCAL ] TEMPORARY ]
 TABLE [ IF NOT EXISTS ] name
-[ ( { columnName columnDefinition | constraint } [,...] ) ]
+[ ( { columnName [columnDefinition] | constraint } [,...] ) ]
 [ ENGINE tableEngineName ]
 [ WITH tableEngineParamName [,...] ]
 [ NOT PERSISTENT ] [ TRANSACTIONAL ]
@@ -769,7 +769,7 @@ in CREATE TABLE, then the engine specified by DEFAULT_TABLE_ENGINE option of dat
 Tables with the NOT PERSISTENT modifier are kept fully in memory, and all
 rows are lost when the database is closed.
 
-The column definition is optional if a query is specified.
+The column definitions are optional if a query is specified.
 In that case the column list of the query is used.
 If the query is specified its results are inserted into created table unless WITH NO DATA is specified.
 

h2/src/docsrc/html/changelog.html

@@ -21,6 +21,8 @@ Change Log
 
 <h2>Next Version (unreleased)</h2>
 <ul>
+<li>Issue #1708: CREATE TABLE AS doesn't support column lists without data types
+</li>
 <li>PR #1707: Fix sort order and ENUM data type in external results
 </li>
 <li>PR #1706: Add hypothetical set functions

h2/src/main/org/h2/command/Parser.java

@@ -7466,12 +7466,12 @@ public class Parser {
         if (readIf(OPEN_PAREN)) {
             command.setIfNotExists(false);
             do {
-                parseTableColumnDefinition(command, schema, tableName);
+                parseTableColumnDefinition(command, schema, tableName, false);
             } while (readIfMore(true));
         } else {
             boolean ifNotExists = readIfNotExists();
             command.setIfNotExists(ifNotExists);
-            parseTableColumnDefinition(command, schema, tableName);
+            parseTableColumnDefinition(command, schema, tableName, false);
         }
         if (readIf("BEFORE")) {
             command.setAddBefore(readColumnIdentifier());
@@ -7717,7 +7717,7 @@ public class Parser {
         if (readIf(OPEN_PAREN)) {
             if (!readIf(CLOSE_PAREN)) {
                 do {
-                    parseTableColumnDefinition(command, schema, tableName);
+                    parseTableColumnDefinition(command, schema, tableName, true);
                 } while (readIfMore(false));
             }
         }
@@ -7806,13 +7806,17 @@ public class Parser {
         return command;
     }
 
-    private void parseTableColumnDefinition(CommandWithColumns command, Schema schema, String tableName) {
-        DefineCommand c = parseAlterTableAddConstraintIf(tableName,
-                schema, false);
+    private void parseTableColumnDefinition(CommandWithColumns command, Schema schema, String tableName,
+            boolean forCreateTable) {
+        DefineCommand c = parseAlterTableAddConstraintIf(tableName, schema, false);
         if (c != null) {
             command.addConstraintCommand(c);
         } else {
             String columnName = readColumnIdentifier();
+            if (forCreateTable && (currentTokenType == COMMA || currentTokenType == CLOSE_PAREN)) {
+                command.addColumn(new Column(columnName, TypeInfo.TYPE_UNKNOWN));
+                return;
+            }
             Column column = parseColumnForTable(columnName, true, true);
             if (column.isAutoIncrement() && column.isPrimaryKey()) {
                 column.setPrimaryKey(false);

h2/src/main/org/h2/command/ddl/CreateTable.java

@@ -21,6 +21,7 @@ import org.h2.schema.Sequence;
 import org.h2.table.Column;
 import org.h2.table.Table;
 import org.h2.util.ColumnNamer;
+import org.h2.value.Value;
 
 /**
  * This class represents the statement
@@ -89,6 +90,14 @@ public class CreateTable extends CommandWithColumns {
                 generateColumnsFromQuery();
             } else if (data.columns.size() != asQuery.getColumnCount()) {
                 throw DbException.get(ErrorCode.COLUMN_COUNT_DOES_NOT_MATCH);
+            } else {
+                ArrayList<Column> columns = data.columns;
+                for (int i = 0; i < columns.size(); i++) {
+                    Column column = columns.get(i);
+                    if (column.getType().getValueType() == Value.UNKNOWN) {
+                        columns.set(i, new Column(column.getName(), asQuery.getExpressions().get(i).getType()));
+                    }
+                }
             }
         }
         changePrimaryKeysToNotNull(data.columns);

h2/src/test/org/h2/test/scripts/ddl/createTable.sql

@@ -114,3 +114,20 @@ SELECT CONSTRAINT_TYPE, TABLE_NAME FROM INFORMATION_SCHEMA.TABLE_CONSTRAINTS WHE
 
 DROP TABLE TEST1, TEST2, TEST3;
 > ok
+
+CREATE TABLE TEST(A);
+> exception UNKNOWN_DATA_TYPE_1
+
+CREATE TABLE TEST(A, B, C) AS SELECT 1, 2, CAST ('A' AS VARCHAR);
+> ok
+
+SELECT COLUMN_NAME, COLUMN_TYPE FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME = 'TEST';
+> COLUMN_NAME COLUMN_TYPE
+> ----------- -----------
+> A           INTEGER
+> B           INTEGER
+> C           VARCHAR
+> rows: 3
+
+DROP TABLE TEST;
+> ok