HSCANIterate a hash's fields and values (single-batch cursor).
| Syntax | HSCAN key cursor [MATCH pattern] [COUNT count] |
| Group | hash |
| Arity | -3 |
| Since | 1.0.0 |
| Flags | readonly |
| Complexity | O(N) — the whole hash is copied and returned in one batch |
| Redis compatibility | differs: not a cursor iterator — the cursor is always 0 and the entire hash comes back in a single reply; NOVALUES is not parsed and COUNT is validated then ignored |