This was the prologue to the SET ANSI OFF thread. When I changed for
optimization's sake (because the customer had complained that the
original code was very slow), I got 0 results due to the legacy code
having SET ANSI OFF.
On 5/11/2021 8:47 PM, MB Software Solutions, LLC wrote:
In case you weren't aware that NOT EMPTY appears to be unable to use
Rushmore optimization...
There is a regular index on the order.srep field. I added the SETs to
emulate the environment per legacy code.
The results are why I changed the original author's NOT EMPTY(field1)
SQL to field1 <> "" instead:
CLEAR
OPEN DATABASE c:\temp\test SHARED
SET ANSI OFF
SET EXACT OFF
SET NEAR ON
LOCAL lcOpt as String
? SYS(3054,12,"lcOpt")
SELECT distinct srep FROM test!order WHERE srep <> "" INTO CURSOR crap
#IF .F.
Results:
SELECT distinct srep FROM test!order WHERE srep <> "" INTO CURSOR
crap
Using index tag Srep to rushmore optimize table order
Rushmore optimization level for table order: partial
#ENDIF
SELECT distinct srep FROM test!order WHERE NOT EMPTY(srep) INTO CURSOR
crap
#IF .F.
Results:
SELECT distinct srep FROM test!order WHERE NOT EMPTY(srep) INTO
CURSOR crap
Rushmore optimization level for table order: none
#ENDIF
--
Michael J. Babcock, MCP
Fox/VFP dev since 1997
Developer of FabNet estimating software - mbsoftwaresolutions.com
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