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-# Query Shape
-A query shape is a transformed version of a command with literal values replaced by a "canonical"
-BSON Type placeholder. Hence, different instances of a command would be considered to have the same
-query shape if they are identical once their literal values are abstracted.
-
-For example, these two queries would have the same shape:
-```js
-db.example.findOne({x: 24});
-db.example.findOne({x: 53});
-```
-While these queries would each have a distinct shape:
-```js
-db.example.findOne({x: 53, y: 1});
-db.example.findOne({x: 53});
-db.example.findOne({x: "string"});
-```
-While different literal _values_ result in the same shape (matching `x` for 23 vs 53), different
-BSON _types_ of the literal are considered distinct shapes (matching `x` for 53 vs "string").
-
-The concept of a query shape exists not just for the find command, but for many of the CRUD commands
-and aggregate. It also includes most (but not all) components of these commands, not just the query
-predicate (MatchExpresssion). In these ways, "query" is meant more generally. While some components
-included in the query shape are shared across the different types of commands (e.g., the "hint"
-field), some are unique. For example, a find command would include a `filter` while an aggregate
-command would have a `pipeline`.
-
-You can see which components are considered part of the query shape or not for each specific shape
-type in their respective "shape component" classes, whose purpose is to determine which components
-are relevant and should be included for determining the shape for specific type of command. The
-structure is as follows:
-- [`CmdSpecificShapeComponents`](query_shape.h#L65)
-    - [`LetShapeComponent`](cmd_with_let_shape.h#L48)
-        - [`AggCmdShapeComponents`](agg_cmd_shape.h#L82)
-        - [`FindCmdShapeComponents`](find_cmd_shape.h#L48)
-
-See more information for the different shapes in their respective classes, structured as follows:
-- [`Shape`](query_shape.h)
-    - [`CmdWithLetShape`](cmd_with_let_shape.h)
-        - [`AggCmdShape`](agg_cmd_shape.h)
-        - [`FindCmdShape`](find_cmd_shape.h)
-
-## Serialization Options
-`SerializationOptions` describes the way we serialize literal values.
-
-There are 3 different serialization options:
-- `kUnchanged`: literals are serialized unmodified
-    - `{x: 5, y: "hello"}` -> `{x: 5, y: "hello"}`
-- `kToDebugTypeString`: human readable format, type string of the literal is serialized
-    - `{x: 5, y: "hello"}` -> `{x: "?number", y: "?string"}`
-- `kToRepresentativeParseableValue`: literal serialized to one canonical value for given type, which
-  must be parseable
-    - `{x: 5, y: "hello"}` -> `{x: 1, y: "?"}`
-    - An example of a query which is serialized differently due to the parseable requirement is `{x:
-      {$regex: "^p.*"}}`. If we serialized the pattern as if it were a normal string we would end up
-      with `{x: {$regex: "?"}}` however `"?"` is not a valid regex pattern, so this would fail
-      parsing. Instead we will serialize it this way to maintain parseability, `{x: {$regex:
-      "\\?"}}`, since `"\\?"` is valid regex.
-
-See [serialization_options.h](serialization_options.h) for more details.
-
-When we compute the [query shape hash](query_shape.cpp#L99-107), we use the
-`kToRepresentativeParseableValue`, since all literals of the same type will become the same value.
-This allows us to group together queries that have the same structure but different literal values
-into the same shape, since they will result in the same hash. The term we use to refer to this is
-"shapify", as we simplify the queries into their query shape.
-
-When shapifying, we try to get as close as possible to the original user input, but there are some
-stages like `$jsonSchema` and `$setWindowFields` that output "internal" stages that are already
-transformed from user input.