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Optimize the argument to the octet_length() function so that it does not

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attempt to read content from disk.

FossilOrigin-Name: 8b8ea4e3f52d96cc217bd1fb27ca4a83489ef1f250756ed2f790d1b0ee529a3a
This commit is contained in:
drh
2023-06-22 21:19:37 +00:00
parent 7f9dcd664d
commit 077efc2730
6 changed files with 29 additions and 19 deletions
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15
src/expr.c
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@@ -4668,10 +4668,10 @@ expr_code_doover:
r1 = sqlite3GetTempRange(pParse, nFarg);
}
/* For length() and typeof() functions with a column argument,
/* For length() and typeof() and octet_length() functions,
** set the P5 parameter to the OP_Column opcode to OPFLAG_LENGTHARG
** or OPFLAG_TYPEOFARG respectively, to avoid unnecessary data
** loading.
** or OPFLAG_TYPEOFARG or OPFLAG_BYTELENARG respectively, to avoid
** unnecessary data loading.
*/
if( (pDef->funcFlags & (SQLITE_FUNC_LENGTH|SQLITE_FUNC_TYPEOF))!=0 ){
u8 exprOp;
@@ -4681,9 +4681,12 @@ expr_code_doover:
if( exprOp==TK_COLUMN || exprOp==TK_AGG_COLUMN ){
assert( SQLITE_FUNC_LENGTH==OPFLAG_LENGTHARG );
assert( SQLITE_FUNC_TYPEOF==OPFLAG_TYPEOFARG );
testcase( pDef->funcFlags & OPFLAG_LENGTHARG );
pFarg->a[0].pExpr->op2 =
pDef->funcFlags & (OPFLAG_LENGTHARG|OPFLAG_TYPEOFARG);
assert( SQLITE_FUNC_BYTELEN==OPFLAG_BYTELENARG );
assert( (OPFLAG_LENGTHARG|OPFLAG_TYPEOFARG)==OPFLAG_BYTELENARG );
testcase( (pDef->funcFlags & OPFLAG_BYTELENARG)==OPFLAG_LENGTHARG );
testcase( (pDef->funcFlags & OPFLAG_BYTELENARG)==OPFLAG_TYPEOFARG );
testcase( (pDef->funcFlags & OPFLAG_BYTELENARG)==OPFLAG_BYTELENARG);
pFarg->a[0].pExpr->op2 = pDef->funcFlags & OPFLAG_BYTELENARG;
}
}