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Functions | |
| UNIV_INLINE const byte * | row_ext_lookup_ith (const row_ext_t *ext, ulint i, ulint *len) |
| UNIV_INLINE const byte * | row_ext_lookup (const row_ext_t *ext, ulint col, ulint *len) |
Detailed Description
Caching of externally stored column prefixes
Created September 2006 Marko Makela
Function Documentation
| UNIV_INLINE const byte* row_ext_lookup | ( | const row_ext_t * | ext, |
| ulint | col, | ||
| ulint * | len | ||
| ) |
Looks up a column prefix of an externally stored column.
- Returns
- column prefix, or NULL if the column is not stored externally, or pointer to field_ref_zero if the BLOB pointer is unset
- Parameters
-
ext in: column prefix cache col in: column number in the InnoDB table object, as reported by dict_col_get_no(); NOT relative to the records in the clustered index len out: length of prefix, in bytes, at most ext->max_len
| UNIV_INLINE const byte* row_ext_lookup_ith | ( | const row_ext_t * | ext, |
| ulint | i, | ||
| ulint * | len | ||
| ) |
Looks up a column prefix of an externally stored column.
- Returns
- column prefix, or NULL if the column is not stored externally, or pointer to field_ref_zero if the BLOB pointer is unset
- Parameters
-
ext in/out: column prefix cache i in: index of ext->ext[] len out: length of prefix, in bytes, at most ext->max_len
