diff options
Diffstat (limited to 'synapse/storage/stream.py')
| -rw-r--r-- | synapse/storage/stream.py | 14 |
1 files changed, 9 insertions, 5 deletions
diff --git a/synapse/storage/stream.py b/synapse/storage/stream.py index 824e77c89e..529ad4ea79 100644 --- a/synapse/storage/stream.py +++ b/synapse/storage/stream.py @@ -78,12 +78,12 @@ def generate_pagination_where_clause( would be generated for dir=b, from_token=(6, 7) and to_token=(5, 3). Note that tokens are considered to be after the row they are in, e.g. if - a row A has a token T, then we consider A to be before T. This covention + a row A has a token T, then we consider A to be before T. This convention is important when figuring out inequalities for the generated SQL, and produces the following result: - - If paginatiting forwards then we exclude any rows matching the from + - If paginating forwards then we exclude any rows matching the from token, but include those that match the to token. - - If paginatiting backwards then we include any rows matching the from + - If paginating backwards then we include any rows matching the from token, but include those that match the to token. Args: @@ -92,8 +92,12 @@ def generate_pagination_where_clause( column_names (tuple[str, str]): The column names to bound. Must *not* be user defined as these get inserted directly into the SQL statement without escapes. - from_token (tuple[int, int]|None) - to_token (tuple[int, int]|None) + from_token (tuple[int, int]|None): The start point for the pagination. + This is an exclusive minimum bound if direction is "f", and an + inclusive maximum bound if direction is "b". + to_token (tuple[int, int]|None): The endpoint point for the pagination. + This is an inclusive maximum bound if direction is "f", and an + exclusive minimum bound if direction is "b". engine: The database engine to generate the clauses for Returns: |