Interface: MemWalWriteSpec¶

Specification selecting Lance's MemWAL LSM-style write path for mergeInsert.

specType is "bucket", "identity", or "unsharded". For "bucket", column and numBuckets are required; for "identity", column is required and must be a deterministic function of the unenforced primary key (every row with a given primary key must always produce the same column value, or upserts of that key can land in different shards and a stale version can win).

Properties¶

column?¶

optional column: string;

Bucket and identity variants: the sharding column.

maintainedIndexes?¶

optional maintainedIndexes: string[];

Indexes the MemWAL keeps up to date. Omit for every index the table has, including ones created later. Pass [] for none.

numBuckets?¶

optional numBuckets: number;

Bucket variant: the number of buckets, in [1, 1024].

specType¶

specType: "bucket" | "identity" | "unsharded";

One of "bucket", "identity", or "unsharded".

writerConfigDefaults?¶

optional writerConfigDefaults: Record<string, string>;

Default ShardWriter configuration recorded in the MemWAL index.