Function column_is_numeric 

pub fn column_is_numeric(fields: &[Field], name: &str) -> bool

Available on crate features sink-spanner or source-spanner only.

Whether the named column in a result’s metadata is Spanner NUMERIC.

The source uses this to reject an incremental-replication cursor on a NUMERIC column: NUMERIC decodes to a JSON string (to preserve precision), so the generic replication comparison orders it lexicographically ("9" > "10"), which would advance the bookmark incorrectly and skip or re-read rows. INT64 (JSON number) and TIMESTAMP/DATE (RFC-3339 string, lexicographic == chrono) cursors are unaffected. Checked once the first page’s metadata is known.