Module builders 

Wrapper types that exist to support the creation of dictionary codecs.

These types interpose at the seal() call, to traverse the data that is being sealed and then construct codecs that are used to encode the row-shaped keys and values. There are several variants, corresponding to the RowRow, RowVal, and Row-only spine types.

Structs

RowBuilder

RowRowBuilder

RowRowColPagedBuilder

Counterpart of RowRowBuilder that consumes ColumnBody chunks instead of columnation stacks, whether or not the batcher that produced them spills. Mirrors RowRowBuilder::seal: it gathers key and value statistics from the sealed chain and installs codecs directly, then drops the per-container stats gatherer.

RowRowColPagedState

The chain-wide state of RowRowColPagedBuilder: the statistics its key and value codecs are built from, and the container sizes the chain implies.

RowValBuilder

ValRowBuilder

Mirror of RowValBuilder with the roles swapped: arbitrary keys and Row values, so the dictionary codec is built for and installed on the value container.

ValRowColPagedBuilder

Paged counterpart of ValRowBuilder that consumes Column chunks. Keys are arbitrary Columnar values (not Row-shaped) and stay uncompressed; only the value container receives a codec.

Functions

build_codec 🔒

Gather encoding statistics across rows and produce a codec from them.

observe_rows 🔒

Fold rows into stats, the accumulator a codec is built from.