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by brian
clean slate |
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/***********************************************************************
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Comparison services for records
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(c) 1994-1996 Innobase Oy
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Created 7/1/1994 Heikki Tuuri
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************************************************************************/
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/*****************************************************************
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This function is used to compare two data fields for which we know the
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data type. */
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UNIV_INLINE |
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int |
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cmp_data_data(
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/*==========*/
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/* out: 1, 0, -1, if data1 is greater, equal, |
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less than data2, respectively */
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ulint mtype, /* in: main type */ |
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ulint prtype, /* in: precise type */ |
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byte* data1, /* in: data field (== a pointer to a memory |
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buffer) */
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ulint len1, /* in: data field length or UNIV_SQL_NULL */ |
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byte* data2, /* in: data field (== a pointer to a memory |
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buffer) */
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ulint len2) /* in: data field length or UNIV_SQL_NULL */ |
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{
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return(cmp_data_data_slow(mtype, prtype, data1, len1, data2, len2)); |
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}
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/*****************************************************************
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This function is used to compare two dfields where at least the first
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has its data type field set. */
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UNIV_INLINE |
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int |
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cmp_dfield_dfield(
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/*==============*/
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/* out: 1, 0, -1, if dfield1 is greater, equal, |
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less than dfield2, respectively */
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dfield_t* dfield1,/* in: data field; must have type field set */ |
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dfield_t* dfield2)/* in: data field */ |
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{
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const dtype_t* type; |
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ut_ad(dfield_check_typed(dfield1)); |
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type = dfield_get_type(dfield1); |
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return(cmp_data_data(type->mtype, type->prtype, |
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dfield_get_data(dfield1), |
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dfield_get_len(dfield1), |
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dfield_get_data(dfield2), |
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dfield_get_len(dfield2))); |
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}
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/*****************************************************************
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This function is used to compare two physical records. Only the common
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first fields are compared. */
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UNIV_INLINE |
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int |
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cmp_rec_rec(
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/*========*/
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/* out: 1, 0 , -1 if rec1 is greater, equal, |
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less, respectively, than rec2; only the common
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first fields are compared */
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rec_t* rec1, /* in: physical record */ |
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rec_t* rec2, /* in: physical record */ |
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const ulint* offsets1,/* in: rec_get_offsets(rec1, index) */ |
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const ulint* offsets2,/* in: rec_get_offsets(rec2, index) */ |
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dict_index_t* index) /* in: data dictionary index */ |
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{
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ulint match_f = 0; |
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ulint match_b = 0; |
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return(cmp_rec_rec_with_match(rec1, rec2, offsets1, offsets2, index, |
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&match_f, &match_b)); |
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}
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