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ab7b4937cb
Only add indexed BLOBs to row_ext. trx_undo_rec_get_partial_row(): Move the BLOB fetching to row_ext_create(). row_build(): Pass only those BLOBs to row_ext_create() that are referenced by ordering columns of some indexes, similar to trx_undo_rec_get_partial_row(). row_ext_create(): Add the parameter "tuple". Move the implementation from row0ext.ic to row0ext.c. row_ext_lookup_ith(), row_ext_lookup(): Return a const pointer. Remove the parameters "field" and "f_len". Make the row_ext_t* parameter const. row_ext_t: Remove the field zip_size. field_ref_zero[]: Declare in btr0types.h instead of btr0cur.h. row_ext_lookup_low(): Rename to row_ext_cache_fill() and change the signature.
71 lines
1.8 KiB
Text
71 lines
1.8 KiB
Text
/******************************************************
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Caching of externally stored column prefixes
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(c) 2006 Innobase Oy
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Created September 2006 Marko Makela
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*******************************************************/
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#include "rem0types.h"
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#include "btr0types.h"
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/************************************************************************
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Looks up a column prefix of an externally stored column. */
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UNIV_INLINE
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const byte*
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row_ext_lookup_ith(
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/*===============*/
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/* out: column prefix, or NULL if
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the column is not stored externally,
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or pointer to field_ref_zero
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if the BLOB pointer is unset */
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const row_ext_t* ext, /* in/out: column prefix cache */
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ulint i, /* in: index of ext->ext[] */
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ulint* len) /* out: length of prefix, in bytes,
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at most REC_MAX_INDEX_COL_LEN */
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{
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ut_ad(ext);
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ut_ad(len);
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ut_ad(i < ext->n_ext);
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*len = ext->len[i];
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if (UNIV_UNLIKELY(*len == 0)) {
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/* The BLOB could not be fetched to the cache. */
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return(field_ref_zero);
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} else {
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return(ext->buf + i * REC_MAX_INDEX_COL_LEN);
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}
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}
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/************************************************************************
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Looks up a column prefix of an externally stored column. */
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UNIV_INLINE
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const byte*
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row_ext_lookup(
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/*===========*/
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/* out: column prefix, or NULL if
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the column is not stored externally,
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or pointer to field_ref_zero
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if the BLOB pointer is unset */
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const row_ext_t* ext, /* in: column prefix cache */
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ulint col, /* in: column number in the InnoDB
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table object, as reported by
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dict_col_get_no(); NOT relative to the
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records in the clustered index */
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ulint* len) /* out: length of prefix, in bytes,
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at most REC_MAX_INDEX_COL_LEN */
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{
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ulint i;
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ut_ad(ext);
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ut_ad(len);
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for (i = 0; i < ext->n_ext; i++) {
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if (col == ext->ext[i]) {
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return(row_ext_lookup_ith(ext, i, len));
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}
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}
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return(NULL);
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}
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