Update Fusion docs and change expression to statement

Author: kesmit13

singlestoredb/fusion/README.md

@@ -10,7 +10,9 @@ time.
 By default, Fusion SQL commands are not processed by the client. They
 must be enabled by setting an environment variable.
 ```
-SINGLESTOREDB_FUSION_ENABLED=1
+import os
+
+os.environ['SINGLESTOREDB_FUSION_ENABLED']='1'
 ```
 
 ## Writing Fusion SQL handler classes
@@ -42,7 +44,7 @@ class ListDirHandler(SQLHandler):
 
     def run(self, params: Dict[str, Any]) -> Optional[result.FusionSQLResult]:
         # Create a result object
-        res = self.create_result()
+        res = result.FusionSQLResult()
 
         # Add a field to the results
         res.add_field('Name', result.STRING)
@@ -271,7 +273,7 @@ class CreateWorkspaceGroupHandler(SQLHandler):
             firewall_ranges=params['with_firewall_ranges'],
         )
 
-        return self.create_result()
+        return None
 
 
 CreateWorkspaceGroupHandler.register()

singlestoredb/fusion/handler.py

@@ -33,7 +33,7 @@
     close_paren = ws* ")" ws*
     open_repeats = ws* ~r"[\(\[\{]" ws*
     close_repeats = ws* ~r"[\)\]\}]" ws*
-    expression = ~r"[\s\S]*" ws*
+    statement = ~r"[\s\S]*" ws*
     table = ~r"(?:([A-Za-z0-9_\-]+)|`([^\`]+)`)(?:\.(?:([A-Za-z0-9_\-]+)|`([^\`]+)`))?" ws*
     column = ~r"(?:([A-Za-z0-9_\-]+)|`([^\`]+)`)(?:\.(?:([A-Za-z0-9_\-]+)|`([^\`]+)`))?" ws*
     link_name = ~r"(?:([A-Za-z0-9_\-]+)|`([^\`]+)`)(?:\.(?:([A-Za-z0-9_\-]+)|`([^\`]+)`))?" ws*
@@ -77,7 +77,7 @@
     '<file-type>': r'''
     file_type = { FILE | FOLDER }
     ''',
-    '<expression>': '',
+    '<statement>': '',
 }
 
 BUILTIN_DEFAULTS = {  # type: ignore
@@ -759,9 +759,9 @@ def visit_init(self, node: Node, visited_children: Iterable[Any]) -> Any:
         _, out, *_ = visited_children
         return out
 
-    def visit_expression(self, node: Node, visited_children: Iterable[Any]) -> Any:
+    def visit_statement(self, node: Node, visited_children: Iterable[Any]) -> Any:
         out = ' '.join(flatten(visited_children)).strip()
-        return {'expression': out}
+        return {'statement': out}
 
     def visit_order_by(self, node: Node, visited_children: Iterable[Any]) -> Any:
         """Handle ORDER BY."""