Introduce DocumentNotFound exception for DynamoDB

CHANGELOG.md

@@ -1,6 +1,10 @@
 CHANGELOG
 =========
 
+0.6.3
+-----
+ - The DynamoDBStatementParser will now throw a DocumentNotFoundException if the table referenced in the statement was not provided
+
 0.6.2
 -----
  - Support negative numbers (both integers and floats)

py_partiql_parser/_internal/parser.py

@@ -2,7 +2,7 @@
 
 from typing import Dict, Any, List, Optional, Tuple
 
-from ..exceptions import ParserException
+from ..exceptions import DocumentNotFoundException, ParserException
 from .delete_parser import DeleteParser
 from .from_parser import DynamoDBFromParser, S3FromParser, FromParser
 from .insert_parser import InsertParser
@@ -110,7 +110,10 @@ def _parse_select(
         # FROM
         from_parser = DynamoDBFromParser(from_clause=clauses[2])
 
-        source_data = self.documents[list(from_parser.clauses.values())[0]]
+        table_name = list(from_parser.clauses.values())[0]
+        if table_name not in self.documents:
+            raise DocumentNotFoundException(name=table_name)
+        source_data = self.documents[table_name]
 
         # WHERE
         if len(clauses) > 3:

py_partiql_parser/exceptions.py

@@ -3,3 +3,9 @@ def __init__(self, name: str, message: str):
         self.name = name
         self.message = message
         super().__init__(message)
+
+
+class DocumentNotFoundException(Exception):
+    def __init__(self, name: str):
+        self.name = name
+        super().__init__(f"Document not found: {name}")

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "py-partiql-parser"
-version = "0.6.2"
+version = "0.6.3"
 description = "Pure Python PartiQL Parser"
 readme = "README.md"
 keywords = ["pypartiql", "parser"]