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06299dddd4
inserted, uncommitted clustered index records when determining if a secondary index record that contains a column prefix of an externally stored column is referencing the clustered index record. field_ref_zero[]: A BLOB pointer full of zero, for use in comparisons. btr_copy_externally_stored_field_prefix(): Assert that the BLOB pointer is set. row_ext_lookup_ith(), row_ext_lookup(), row_ext_lookup_low(): Document that field_ref_zero is returned when the BLOB cannot be fetched. row_ext_lookup_low(): Return field_ref_zero and *len = 0 when the BLOB pointer is unset. row_build_index_entry(): Return NULL when a needed BLOB pointer cannot be dereferenced (row_ext_lookup returns field_ref_zero). Check the return value for NULL in callers. row_vers_impl_x_locked_off_kernel(): Avoid comparisons when row_build_index_entry() returns NULL. row_vers_old_has_index_entry(): Ignore records for which row_build_index_entry() returns NULL. The entry should never be NULL in rollback, but it may be NULL in purge. row_merge_buf_add(): Assert that row_ext_lookup() does not return field_ref_zero. The table will be locked during index creation.
80 lines
2.6 KiB
C
80 lines
2.6 KiB
C
/******************************************************
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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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#ifndef row0ext_h
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#define row0ext_h
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#include "univ.i"
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#include "row0types.h"
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#include "mem0mem.h"
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/************************************************************************
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Creates a cache of column prefixes of externally stored columns. */
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UNIV_INLINE
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row_ext_t*
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row_ext_create(
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/*===========*/
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/* out,own: column prefix cache */
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ulint n_ext, /* in: number of externally stored columns */
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const ulint* ext, /* in: col_no's of externally stored columns
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in the InnoDB table object, as reported by
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dict_col_get_no(); NOT relative to the records
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in the clustered index */
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ulint zip_size,/* compressed page size, or 0 */
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mem_heap_t* heap); /* in: heap where created */
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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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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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row_ext_t* ext, /* in/out: column prefix cache */
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ulint i, /* in: ith element of 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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Looks up a column prefix of an externally stored column. */
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UNIV_INLINE
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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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row_ext_t* ext, /* in/out: 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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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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/* Prefixes of externally stored columns */
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struct row_ext_struct{
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ulint n_ext; /* number of externally stored columns */
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const ulint* ext; /* col_no's of externally stored columns */
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ulint zip_size;/* compressed page size, or 0 */
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byte* buf; /* backing store of the column prefix cache */
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ulint len[1]; /* prefix lengths; 0 if not cached */
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};
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#ifndef UNIV_NONINL
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#include "row0ext.ic"
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#endif
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#endif
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