MonetDB: Jul2017 - Avoid deadcode triggered by returning a bat

[Martin Kersten]

Changeset: fcde2c72b6c8 for MonetDB
URL: https://dev.monetdb.org/hg/MonetDB?cmd=changeset;node=fcde2c72b6c8
Modified Files:
        monetdb5/optimizer/opt_deadcode.c
Branch: Jul2017
Log Message:

Avoid deadcode triggered by returning a bat


diffs (12 lines):

diff --git a/monetdb5/optimizer/opt_deadcode.c 
b/monetdb5/optimizer/opt_deadcode.c
--- a/monetdb5/optimizer/opt_deadcode.c
+++ b/monetdb5/optimizer/opt_deadcode.c
@@ -58,7 +58,7 @@ OPTdeadcodeImplementation(Client cntxt, 
                        varused[getArg(p,0)]++; // force keeping 
                        continue;
                }
-               if ( getModuleId(p) == batRef && isUpdateInstruction(p)){
+               if ( getModuleId(p) == batRef && isUpdateInstruction(p) && 
!p->barrier){
                        /* bat.append and friends are intermediates that need 
not be retained 
                         * unless they are used */
                } else
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