Alexandr Savinov

Lambdo link was pointing to wrong project. The link is updated so that the project corresponds to its description.

Problem: currently it is not possible to set initial value for aggregations (a default value is always used). For example, if we use sum for aggregation then default initial value...

Implement helper functions: * Print current data schema, that is, list of tables, list of columns and their connections. For example, names `print_schema` * Print graph of operations with dependencies....

Currently Column-SQL is parsed using a simple function. Although it words, it has some limitations, for example, with respect to literals, enforcing more flexible syntactic rules etc. The goal of...

The parser returns a syntactic structure. The task is to validate this structure. The main alternative is * Validate without name resolution and bindings. It is relatively simple because we...

Problem: the aggregation operation works only with link columns for grouping. It is a column operation which adds a new aggregate column to the group table. The group table must...