Amazon Technologies, Inc.

Andrew Desmond Budiman

Wei Xiao

Fahad Ahmed

Usman Ahmed Shami

Jeffrey Hocheng Nieh

David Craig Yanacek

Fehmi Dogus Ertemur

A client application may interact with a database service using a data interchange format with limited support for database data types or query representations. A map may be supported in the interchange format as a collection of name-value pairs. A database query may be parsed to form an abstract syntax tree. From the abstract syntax tree, a hierarchy of nested maps may be formed to represent the query, based on schemas mapping from regions of the abstract syntax tree to maps in the interchange format.

Query transmission in type-limited interchange formats

A repository of key-value data may store a first object value having an internal structure of a hierarchy of sub-objects. The repository may receive a request to modify the first object, expressed as a projection of locations in the object to be updated and a function that, upon evaluation, returns values to be used to update the projected locations of the object. The repository may determine that the locations specified by the projections correspond to non-overlapping regions of the object and, based on the determination, update the object using the results of evaluating the function.

Projection-based updates

A database may store an object comprising a hierarchy of sub-objects. Numeric identifiers may be assigned to names of the sub-objects and used in place of the names when writing the object to storage. Scalar values may be prefixed with length indicators. Collections may be prefixed with counts indicative of the number of elements in the corresponding collection. A portion of the object may be retrieved from storage by traversing a path from the root of the hierarchy to the desired portion. Length and count information may be used to skip over portions of the object during the traversal.

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Sunnyvale, CA, United States of America

Andrew Desmond Budiman