Validate returns an error for the first name that is not a column. The error
names the closest columns when any are close and always points at the command
that lists them, so a typo stops the query instead of producing a blank
column.
type Column struct {
Name string Source Source Description string// InIndex reports whether the SQLite index can answer the column. Columns// without it force the query onto the parquet files, which is slower.
InIndex bool
}