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Overview
Comment:Update comments on OP_MakeRecord. No changes to code.
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SHA1: 70d85ff0514bfd34a29e15013c5708064bcbeec8
User & Date: drh 2013-07-25 02:52:10
Context
2013-07-25
12:12
Fixes to sqlite4FindInIndex so as to handle WHERE clauses of the form "x IN (SELECT a FROM tbl)" where there are usable indexes on both "a" and "x". check-in: 856ed13e06 user: dan tags: trunk
02:52
Update comments on OP_MakeRecord. No changes to code. check-in: 70d85ff051 user: drh tags: trunk
01:12
Fix the RowDecoder caching logic by adding new cache clears to opcodes that move the cursor. check-in: d5abe1bca0 user: drh tags: trunk
Changes
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Changes to src/vdbe.c.

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**
** P4 may be a string that is P2 characters long, or it may be NULL. The nth 
** character of the string indicates the column affinity that should be used
** for the nth field of the index key. The mapping from character to affinity
** is given by the SQLITE4_AFF_ macros defined in sqliteInt.h. If P4 is NULL
** then all index fields have the affinity NONE.
**
** This opcode expands any zero-blobs within the input array. Then if





** P4 is not NULL it applies the affinities that it specifies to the input
** array elements. Finally, if P3 is not 0, it encodes the input array
** into a data record and stores the result in register P3. The OP_Column 
** opcode can be used to decode the record.
**
** Specifying P3==0 is only useful if the previous opcode is an OP_MakeKey.
*/
case OP_MakeKey:
case OP_MakeRecord: {







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**
** P4 may be a string that is P2 characters long, or it may be NULL. The nth 
** character of the string indicates the column affinity that should be used
** for the nth field of the index key. The mapping from character to affinity
** is given by the SQLITE4_AFF_ macros defined in sqliteInt.h. If P4 is NULL
** then all index fields have the affinity NONE.
**
** If this instruction is immediately preceded by OP_Permutation, then the
** specified permutation is used to determine the order that registers are
** used to build the record.  The i-th column of the record is taken from
** register P1+aPermute[i].  If OP_Permutation has not been run, then the i-th
** column comes from register P1+i.
**
** This opcode applies the affinities that it specifies to the input
** array elements. Then, if P3 is not 0, it encodes the input array
** into a data record and stores the result in register P3. The OP_Column 
** opcode can be used to decode the record.
**
** Specifying P3==0 is only useful if the previous opcode is an OP_MakeKey.
*/
case OP_MakeKey:
case OP_MakeRecord: {