New feature INSERT INTO ... DIRECT SELECT, mainly to speed up loading tables from a CSV file.

h2/src/docsrc/help/help.csv

@@ -43,9 +43,13 @@ SELECT * FROM (SELECT ID, COUNT(*) FROM TEST
 
 "Commands (DML)","INSERT","
 INSERT INTO tableName [ ( columnName [,...] ) ]
-{ VALUES { ( { DEFAULT | expression } [,...] ) } [,...] | select }
+{ VALUES { ( { DEFAULT | expression } [,...] ) } [,...] | [ DIRECT ] [ SORTED ] select }
 ","
 Inserts a new row / new rows into a table.
+
+When using DIRECT, then the results from the query are directly applied in the target table without any intermediate step.
+
+When using SORTED, b-tree pages are split at the insertion point. This can improve performance and reduce disk usage.
 ","
 INSERT INTO TEST VALUES(1, 'Hello')
 "

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

@@ -921,6 +921,9 @@ public class Parser {
         read("INTO");
         Table table = readTableOrView();
         command.setTable(table);
+        if (readIf("DIRECT")) {
+            command.setInsertFromSelect(true);
+        }
         if (readIf("SORTED")) {
             command.setSortedInsertMode(true);
         }
@@ -2277,7 +2280,6 @@ public class Parser {
                     throw DbException.get(ErrorCode.DATABASE_NOT_FOUND_1, databaseName);
                 }
                 schema = objectName;
-                objectName = name;
                 return readFunction(database.getSchema(schema), name);
             } else if (readIf(".")) {
                 String databaseName = schema;