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Remove redundant branches in window function processing.

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FossilOrigin-Name: 8fdaf3f37e5ddac9b7337a50f32f5d2bcdd64780797f08cfd3fccfa95819edfe
This commit is contained in:
drh
2018-07-09 17:33:24 +00:00
parent a57aac262f
commit 7999cc434e
3 changed files with 11 additions and 9 deletions
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6
src/window.c
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@@ -1596,7 +1596,8 @@ static void windowCodeRowExprStep(
** }
** regEnd = regEnd - regStart;
*/
if( pMWin->pEnd && pMWin->pStart && pMWin->eStart==TK_FOLLOWING ){
if( pMWin->pEnd && pMWin->eStart==TK_FOLLOWING ){
assert( pMWin->pStart!=0 );
assert( pMWin->eEnd==TK_FOLLOWING );
sqlite3VdbeAddOp3(v, OP_Ge, regStart, sqlite3VdbeCurrentAddr(v)+2, regEnd);
VdbeCoverage(v);
@@ -1604,7 +1605,8 @@ static void windowCodeRowExprStep(
sqlite3VdbeAddOp3(v, OP_Subtract, regStart, regEnd, regEnd);
}
if( pMWin->pEnd && pMWin->pStart && pMWin->eEnd==TK_PRECEDING ){
if( pMWin->pStart && pMWin->eEnd==TK_PRECEDING ){
assert( pMWin->pEnd!=0 );
assert( pMWin->eStart==TK_PRECEDING );
sqlite3VdbeAddOp3(v, OP_Le, regStart, sqlite3VdbeCurrentAddr(v)+3, regEnd);
VdbeCoverage(v);