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40 lines
1 KiB
C
40 lines
1 KiB
C
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/******************************************************
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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 "row0ext.h"
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#ifdef UNIV_NONINL
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#include "row0ext.ic"
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#endif
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#include "btr0cur.h"
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/************************************************************************
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Looks up and caches a column prefix of an externally stored column. */
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byte*
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row_ext_lookup_low(
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/*===============*/
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/* out: column prefix */
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row_ext_t* ext, /* in/out: column prefix cache */
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ulint i, /* in: index of ext->ext[] */
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const byte* field, /* in: locally stored part of the column */
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ulint f_len, /* in: length of field, in bytes */
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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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byte* buf = ext->buf + i * REC_MAX_INDEX_COL_LEN;
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ut_ad(i < ext->n_ext);
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*len = ext->len[i] = btr_copy_externally_stored_field_prefix(
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buf,
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REC_MAX_INDEX_COL_LEN, ext->zip_size, field, f_len);
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return(buf);
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}
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