I O Execution

I/O Execution

Lance creates an execution plan to serve each scan / search request. An execution plan is a graph of execution node.

Execution Node Contract.

Execution Node	Parameters	Input Schema	Output Schema
Scan	dataset, projected columns	N/A	projected columns
Filter	input node, filter	any	input schema + columns in filters
Take	input node	any, must have a "_rowid" column	input schema minus _rowid
KNNFlatExec	input node, query	any	input schema + {"scores"}
KNNIndexExec	dataset	N/A	{"score", "_rowid"}