date:20170301

MonetDB: default - Approve output

2017-03-01 Thread Martin Kersten

Changeset: 8ed17956f2f4 for MonetDB
URL: http://dev.monetdb.org/hg/MonetDB?cmd=changeset;node=8ed17956f2f4
Modified Files:
sql/test/BugTracker-2016/Tests/decimal_vs_integer.Bug-3941.stable.out
Branch: default
Log Message:

Approve output


diffs (37 lines):

diff --git 
a/sql/test/BugTracker-2016/Tests/decimal_vs_integer.Bug-3941.stable.out 
b/sql/test/BugTracker-2016/Tests/decimal_vs_integer.Bug-3941.stable.out
--- a/sql/test/BugTracker-2016/Tests/decimal_vs_integer.Bug-3941.stable.out
+++ b/sql/test/BugTracker-2016/Tests/decimal_vs_integer.Bug-3941.stable.out
@@ -38,9 +38,7 @@ Ready.
 % 112 # length
 function user.s4_1():void;
 X_2:void := querylog.define("explain select count(*) from tmp where i = 
20160222;", "default_pipe", 12:int);
-X_12 := bat.new(nil:int);
-C_14 := algebra.thetaselect(X_12, 20160222:int, "==");
-X_16 := algebra.projection(C_14, X_12);
+X_16 := bat.new(nil:int);
 X_17 := aggr.count(X_16);
 sql.resultSet("sys.L4", "L3", "bigint", 64:int, 0:int, 7:int, X_17);
 end user.s4_1;
@@ -53,9 +51,7 @@ end user.s4_1;
 % 118 # length
 function user.s6_1():void;
 X_2:void := querylog.define("explain select count(*) from tmp where i = 
\\'20160222\\';", "default_pipe", 13:int);
-X_12 := bat.new(nil:int);
-C_16 := algebra.thetaselect(X_12, 20160222:int, "==");
-X_18 := algebra.projection(C_16, X_12);
+X_18 := bat.new(nil:int);
 X_19 := aggr.count(X_18);
 sql.resultSet("sys.L4", "L3", "bigint", 64:int, 0:int, 7:int, X_19);
 end user.s6_1;
@@ -68,10 +64,7 @@ end user.s6_1;
 % 113 # length
 function user.s8_1():void;
 X_2:void := querylog.define("explain select count(*) from tmp where i = 
201602221;", "default_pipe", 13:int);
-X_12 := bat.new(nil:int);
-X_13:bat[:int] := batcalc.int(0:int, X_12, 9:int, 0:int);
-C_18 := algebra.thetaselect(X_13, 201602221:int, "==");
-X_20 := algebra.projection(C_18, X_12);
+X_20 := bat.new(nil:int);
 X_21 := aggr.count(X_20);
 sql.resultSet("sys.L4", "L3", "bigint", 64:int, 0:int, 7:int, X_21);
 end user.s8_1;
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MonetDB: default - Add thetaselect and bat updates

2017-03-01 Thread Martin Kersten

Changeset: f8afc241d5a2 for MonetDB
URL: http://dev.monetdb.org/hg/MonetDB?cmd=changeset;node=f8afc241d5a2
Modified Files:
monetdb5/optimizer/opt_emptybind.c
Branch: default
Log Message:

Add thetaselect and bat updates
Empty sets can be propagated.


diffs (240 lines):

diff --git a/monetdb5/optimizer/opt_emptybind.c 
b/monetdb5/optimizer/opt_emptybind.c
--- a/monetdb5/optimizer/opt_emptybind.c
+++ b/monetdb5/optimizer/opt_emptybind.c
@@ -20,6 +20,15 @@
 #include "opt_deadcode.h"
 #include "mal_builder.h"
 
+#define addresult(I)   
\
+   do {
\
+   int tpe = getVarType(mb,getArg(p,I));   \
+   q= newStmt(mb, batRef, newRef); 
\
+   getArg(q,0)= getArg(p,I);   
\
+   q = pushType(mb, q, getBatType(tpe));   \
+   empty[getArg(q,0)]= 1;  
\
+   } while (0)
+
 #define emptyresult(I) 
\
do {
\
int tpe = getVarType(mb,getArg(p,I));   \
@@ -30,6 +39,7 @@
p = pushType(mb,p, getBatType(tpe));\
setVarType(mb, getArg(p,0), tpe);   
\
setVarFixed(mb, getArg(p,0));   
\
+   empty[getArg(p,0)]= 1;  
\
} while (0)
 
 
@@ -37,7 +47,7 @@ int
 OPTemptybindImplementation(Client cntxt, MalBlkPtr mb, MalStkPtr stk, InstrPtr 
pci)
 {
int i,j, actions =0;
-   int *marked;
+   int *empty;
int limit = mb->stop, slimit = mb->ssize;
InstrPtr p, q, *old = mb->stmt, *updated;
char buf[256];
@@ -55,19 +65,19 @@ OPTemptybindImplementation(Client cntxt,
goto wrapup;
 
// track of where 'emptybind' results are produced
-   marked = (int *) GDKzalloc(mb->vsize * sizeof(int));
-   if ( marked == NULL)
+   empty = (int *) GDKzalloc(mb->vsize * sizeof(int));
+   if ( empty == NULL)
return 0;
 
updated= (InstrPtr *) GDKzalloc(esize * sizeof(InstrPtr));
if( updated == 0){
-   GDKfree(marked);
+   GDKfree(empty);
return 0;
}
(void) stk;
 
/* Got an instructions V:= bat.new(:tpe) 
-* The form the initial family of marked sets.
+* The form the initial family of empty sets.
 */
 
(void) cntxt;
@@ -102,7 +112,7 @@ OPTemptybindImplementation(Client cntxt,
 #ifdef DEBUG_OPT_EMPTYBIND
mnstr_printf(cntxt->fdout, "#empty bat  pc %d var 
%d\n",i , getArg(p,0) );
 #endif
-   marked[getArg(p,0)] = i;
+   empty[getArg(p,0)] = i;
continue;
} 
 
@@ -111,14 +121,14 @@ OPTemptybindImplementation(Client cntxt,
if ( etop == esize){
updated = (InstrPtr*) GDKrealloc( updated, 
(esize += 256) * sizeof(InstrPtr));
if( updated == NULL){
-   GDKfree(marked);
+   GDKfree(empty);
goto wrapup;
}
}
updated[etop++]= p;
}
 
-   /* restore the naming, dropping the runtime property 'marked' */
+   /* restore the naming, dropping the runtime property 'empty' */
if (getFunctionId(p) == emptybindRef) {
 #ifdef DEBUG_OPT_EMPTYBIND
mnstr_printf(cntxt->fdout, "#empty bind  pc %d var 
%d\n",i , getArg(p,0) );
@@ -126,9 +136,9 @@ OPTemptybindImplementation(Client cntxt,
actions++;
setFunctionId(p,bindRef);
p->typechk= TYPE_UNKNOWN;
-   marked[getArg(p,0)] = i;
+   empty[getArg(p,0)] = i;
if( p->retc == 2){
-   marked[getArg(p,1)] = i;
+   empty[getArg(p,1)] = i;
 #ifdef DEBUG_OPT_EMPTYBIND
mnstr_printf(cntxt->fdout, "#empty update bind  
pc %d var %d\n",i , getArg(p,1) );
 #endif
@@ -144,30 +154,30 @@ OPTemptybindImplementation(Client cntxt,
 #ifdef DEBUG_OPT_EMPTYBIND
mnstr_printf(cntxt->fdout, 
"#reset mark empty variable pc %d var %d\n",i , getArg(p,0) );
 #endif
-

MonetDB: Dec2016 - Fix or crash reported in bug 6220.

2017-03-01 Thread Sjoerd Mullender

Changeset: 9fdb3a8b4c32 for MonetDB
URL: http://dev.monetdb.org/hg/MonetDB?cmd=changeset;node=9fdb3a8b4c32
Modified Files:
sql/server/rel_select.c
Branch: Dec2016
Log Message:

Fix or crash reported in bug 6220.


diffs (12 lines):

diff --git a/sql/server/rel_select.c b/sql/server/rel_select.c
--- a/sql/server/rel_select.c
+++ b/sql/server/rel_select.c
@@ -4881,7 +4881,7 @@ rel_query(mvc *sql, sql_rel *rel, symbol
/* reset error */
sql->session->status = 0;
sql->errstr[0] = 0;
-   if (used)
+   if (used && rel)
rel = rel_dup(rel);
if (!used && (!sn->lateral && !lateral) && rel) 
{
sql_rel *o = rel;
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MonetDB: default - Simplify code for debugging

2017-03-01 Thread Martin Kersten

Changeset: 7401c070465b for MonetDB
URL: http://dev.monetdb.org/hg/MonetDB?cmd=changeset;node=7401c070465b
Modified Files:
monetdb5/mal/mal.h
monetdb5/mal/mal_debugger.c
monetdb5/mal/mal_function.c
monetdb5/mal/mal_instruction.c
monetdb5/mal/mal_instruction.h
Branch: default
Log Message:

Simplify code for debugging


diffs (138 lines):

diff --git a/monetdb5/mal/mal.h b/monetdb5/mal/mal.h
--- a/monetdb5/mal/mal.h
+++ b/monetdb5/mal/mal.h
@@ -146,7 +146,14 @@ typedef struct SYMDEF {
 typedef struct VARRECORD {
char id[IDLENGTH];  /* use the space for the full 
name */
malType type;   /* internal type signature */
-   short flags;/* see below, reserve 
some space */
+unsigned short constant:1,
+typevar:1,
+fixedtype:1,
+udftype:1,
+cleanup:1,
+initialized:1,
+used:1,
+disabled:1;
short depth;/* scope block depth, set to -1 
if not used */
short worker;   /* thread id of last worker 
producing it */
ValRecord value;
diff --git a/monetdb5/mal/mal_debugger.c b/monetdb5/mal/mal_debugger.c
--- a/monetdb5/mal/mal_debugger.c
+++ b/monetdb5/mal/mal_debugger.c
@@ -1228,7 +1228,7 @@ printStackElm(stream *f, MalBlkPtr mb, V
if (strcmp(nmeOnStk, nme) && strncmp(nmeOnStk, "BAT", 3))
mnstr_printf(f, "!%s ", nmeOnStk);
mnstr_printf(f, " %s", (isVarConstant(mb, index) ? " constant" : ""));
-   /* mnstr_printf(f, " %s", (isVarUsed(mb,index) ? "": " not used" ));*/
+   mnstr_printf(f, " %s", (isVarUsed(mb,index) ? "": " not used" ));
mnstr_printf(f, " %s", (isVarTypedef(mb, index) ? " type variable" : 
""));
GDKfree(nme);
mnstr_printf(f, "\n");
diff --git a/monetdb5/mal/mal_function.c b/monetdb5/mal/mal_function.c
--- a/monetdb5/mal/mal_function.c
+++ b/monetdb5/mal/mal_function.c
@@ -629,6 +629,10 @@ setVariableScope(MalBlkPtr mb)
dflow= -1;
else depth--;
}
+   if( blockReturn(p)){
+   for (k = 0; k < p->argc; k++)
+   setVarEolife(mb,getArg(p,k),pc);
+   }
}
for (k = 0; k < mb->vtop; k++)
if( getVarEolife(mb,k) == 0)
diff --git a/monetdb5/mal/mal_instruction.c b/monetdb5/mal/mal_instruction.c
--- a/monetdb5/mal/mal_instruction.c
+++ b/monetdb5/mal/mal_instruction.c
@@ -768,7 +768,13 @@ clearVariable(MalBlkPtr mb, int varid)
if (isVarConstant(mb, varid) || isVarDisabled(mb, varid))
VALclear(>value);
v->type = 0;
-   v->flags = 0;
+   v->constant= 0;
+   v->typevar= 0;  
+   v->fixedtype= 0;
+   v->udftype= 0;
+   v->cleanup= 0;
+   v->initialized= 0;
+   v->used= 0;
v->rowcnt = 0;
v->eolife = 0;
v->stc = 0;
diff --git a/monetdb5/mal/mal_instruction.h b/monetdb5/mal/mal_instruction.h
--- a/monetdb5/mal/mal_instruction.h
+++ b/monetdb5/mal/mal_instruction.h
@@ -51,38 +51,39 @@
 #define getVarGDKType(M,I) getGDKType((M)->var[I].type)
 #define setVarType(M,I,V)   (M)->var[I].type = V
 
-#define clrVarFixed(M,I)   ((M)->var[I].flags &= ~VAR_FIXTYPE)
-#define setVarFixed(M,I)   ((M)->var[I].flags |= VAR_FIXTYPE)
-#define isVarFixed(M,I)((M)->var[I].flags & VAR_FIXTYPE)
+#define clrVarFixed(M,I)   ((M)->var[I].fixedtype = 0)
+#define setVarFixed(M,I)   ((M)->var[I].fixedtype =1)
+#define isVarFixed(M,I)((M)->var[I].fixedtype)
 
-#define clrVarCleanup(M,I) ((M)->var[I].flags &= ~VAR_CLEANUP)
-#define setVarCleanup(M,I) ((M)->var[I].flags |= VAR_CLEANUP)
-#define isVarCleanup(M,I)  ((M)->var[I].flags & VAR_CLEANUP)
+#define clrVarCleanup(M,I) ((M)->var[I].cleanup = 0)
+#define setVarCleanup(M,I) ((M)->var[I].cleanup = 1)
+#define isVarCleanup(M,I)  ((M)->var[I].cleanup )
+
 #define isTmpVar(M,I)  (*getVarName(M,I) == REFMARKER && 
*(getVarName(M,I)+1) == TMPMARKER)
 
-#define clrVarUsed(M,I)((M)->var[I].flags &= ~VAR_USED)
-#define setVarUsed(M,I)((M)->var[I].flags |= VAR_USED)
-#define isVarUsed(M,I) ((M)->var[I].flags & VAR_USED)
+#define clrVarUsed(M,I)((M)->var[I].used = 0)
+#define setVarUsed(M,I)((M)->var[I].used = 1)
+#define isVarUsed(M,I) ((M)->var[I].used)
 
-#define clrVarDisabled(M,I)((M)->var[I].flags &= ~VAR_DISABLED)
-#define setVarDisabled(M,I)((M)->var[I].flags |= VAR_DISABLED)
-#define isVarDisabled(M,I) ((M)->var[I].flags & VAR_DISABLED)
+#define clrVarDisabled(M,I)((M)->var[I].disabled= 0 )

MonetDB: default - Push aside incomplete code

2017-03-01 Thread Martin Kersten

Changeset: d350ab890b8e for MonetDB
URL: http://dev.monetdb.org/hg/MonetDB?cmd=changeset;node=d350ab890b8e
Modified Files:
monetdb5/optimizer/opt_garbageCollector.c
Branch: default
Log Message:

Push aside incomplete code


diffs (30 lines):

diff --git a/monetdb5/optimizer/opt_garbageCollector.c 
b/monetdb5/optimizer/opt_garbageCollector.c
--- a/monetdb5/optimizer/opt_garbageCollector.c
+++ b/monetdb5/optimizer/opt_garbageCollector.c
@@ -25,8 +25,8 @@
 int
 OPTgarbageCollectorImplementation(Client cntxt, MalBlkPtr mb, MalStkPtr stk, 
InstrPtr pci)
 {
-   int i, j, k, limit, slimit;
-   InstrPtr p, q,  *old;
+   int i, j, limit, slimit;
+   InstrPtr p, *old;
int actions = 0;
char buf[256];
lng usec = GDKusec();
@@ -99,6 +99,7 @@ OPTgarbageCollectorImplementation(Client
 * otherwise we could not inject the assignment */
if (blockExit(p) ){
/* force garbage collection of all declared within 
output block and ending here  */
+/* ignore for the time being, it requires a more thorough analysis of 
dependencies.
for( k = stmtlnk[i]; k; k = varlnk[k])
if( isaBatType(getVarType(mb,k)) ){
q = newAssignment(mb);
@@ -110,6 +111,7 @@ OPTgarbageCollectorImplementation(Client
setVarEolife(mb,k,mb->stop-1);
actions++;
}
+*/
}
}
assert(p);
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MonetDB: default - Approve output

2017-03-01 Thread Martin Kersten

Changeset: b297a9fcaa44 for MonetDB
URL: http://dev.monetdb.org/hg/MonetDB?cmd=changeset;node=b297a9fcaa44
Modified Files:
monetdb5/optimizer/Tests/GCexample01.stable.out
monetdb5/optimizer/Tests/tst4006.stable.out
Branch: default
Log Message:

Approve output


diffs (102 lines):

diff --git a/monetdb5/optimizer/Tests/GCexample01.stable.out 
b/monetdb5/optimizer/Tests/GCexample01.stable.out
--- a/monetdb5/optimizer/Tests/GCexample01.stable.out
+++ b/monetdb5/optimizer/Tests/GCexample01.stable.out
@@ -37,20 +37,17 @@ function user.qry():void;   
 barrier (x:oid, z:int) := iterator.new(b:bat[:int]);   #[5] (0) ITRbunIterator 
7 8 <- 1 
 io.print(x:oid);   #[6] (0) IOprint_val 9 <- 7 
 exit (x:oid, z:int);   #[7] (0)  7 8 
-b:bat[:int] := nil:bat[:int];  #[8] (0)  1 <- 16 
-barrier (x:oid, z:int) := iterator.new(c:bat[:int]);   #[9] (0) ITRbunIterator 
7 8 <- 3 
-io.print(x:oid);   #[10] (0) IOprint_val 10 <- 7 
-redo (x:oid, z:int) := iterator.next(c:bat[:int]); #[11] (0) ITRbunNext 7 
8 <- 3 
-exit (x:oid, z:int);   #[12] (0)  7 8 
-c:bat[:int] := nil:bat[:int];  #[13] (0)  3 <- 18 
+barrier (x:oid, z:int) := iterator.new(c:bat[:int]);   #[8] (0) ITRbunIterator 
7 8 <- 3 
+io.print(x:oid);   #[9] (0) IOprint_val 10 <- 7 
+redo (x:oid, z:int) := iterator.next(c:bat[:int]); #[10] (0) ITRbunNext 7 
8 <- 3 
+exit (x:oid, z:int);   #[11] (0)  7 8 
 # do not close d, it may be reused 
-barrier go:bit := true:bit;#[15] (0)  12 <- 13 
-io.print(d:bat[:int]); #[16] (0) IOprint_val 14 <- 4 
-redo go:bit := true:bit;   #[17] (0)  12 <- 13 
-exit go:bit;   #[18] (0)  12 
-d:bat[:int] := nil:bat[:int];  #[19] (0)  4 <- 20 
-end user.qry;  #[20] (0)  
-#garbagecollector actions= 4 time=31 usec 
+barrier go:bit := true:bit;#[13] (0)  12 <- 13 
+io.print(d:bat[:int]); #[14] (0) IOprint_val 14 <- 4 
+redo go:bit := true:bit;   #[15] (0)  12 <- 13 
+exit go:bit;   #[16] (0)  12 
+end user.qry;  #[17] (0)  
+#garbagecollector actions= 1 time=21 usec 
 function user.qry():void;  #[0] (0)  0 
 b:bat[:int] := bat.new(:int);  #[1] (0) CMDBATnew 1 <- 2 
 c:bat[:int] := bat.new(:int);  #[2] (0) CMDBATnew 3 <- 2 
@@ -59,20 +56,17 @@ function user.qry():void;   
 barrier (x:oid, z:int) := iterator.new(b:bat[:int]);   #[5] (0) ITRbunIterator 
7 8 <- 1 
 io.print(x:oid);   #[6] (0) IOprint_val 9 <- 7 
 exit (x:oid, z:int);   #[7] (0)  7 8 
-b:bat[:int] := nil:bat[:int];  #[8] (0)  1 <- 16 
-barrier (x:oid, z:int) := iterator.new(c:bat[:int]);   #[9] (0) ITRbunIterator 
7 8 <- 3 
-io.print(x:oid);   #[10] (0) IOprint_val 10 <- 7 
-redo (x:oid, z:int) := iterator.next(c:bat[:int]); #[11] (0) ITRbunNext 7 
8 <- 3 
-exit (x:oid, z:int);   #[12] (0)  7 8 
-c:bat[:int] := nil:bat[:int];  #[13] (0)  3 <- 18 
+barrier (x:oid, z:int) := iterator.new(c:bat[:int]);   #[8] (0) ITRbunIterator 
7 8 <- 3 
+io.print(x:oid);   #[9] (0) IOprint_val 10 <- 7 
+redo (x:oid, z:int) := iterator.next(c:bat[:int]); #[10] (0) ITRbunNext 7 
8 <- 3 
+exit (x:oid, z:int);   #[11] (0)  7 8 
 # do not close d, it may be reused  
-barrier go:bit := true:bit;#[15] (0)  12 <- 13 
-io.print(d:bat[:int]); #[16] (0) IOprint_val 14 <- 4 
-redo go:bit := true:bit;   #[17] (0)  12 <- 13 
-exit go:bit;   #[18] (0)  12 
-d:bat[:int] := nil:bat[:int];  #[19] (0)  4 <- 20 
-end user.qry;  #[20] (0)  
-#garbagecollector actions= 4 time=31 usec 
+barrier go:bit := true:bit;#[13] (0)  12 <- 13 
+io.print(d:bat[:int]); #[14] (0) IOprint_val 14 <- 4 
+redo go:bit := true:bit;   #[15] (0)  12 <- 13 
+exit go:bit;   #[16] (0)  12 
+end user.qry;  #[17] (0)  
+#garbagecollector actions= 1 time=21 usec 
 
 # 23:17:49 >  
 # 23:17:49 >  Done.
diff --git a/monetdb5/optimizer/Tests/tst4006.stable.out 
b/monetdb5/optimizer/Tests/tst4006.stable.out
--- a/monetdb5/optimizer/Tests/tst4006.stable.out
+++ b/monetdb5/optimizer/Tests/tst4006.stable.out
@@ -34,12 +34,10 @@ barrier V12:bit := true:bit;
 V13:any := algebra.union(x:bat[:int], z:bat[:int]);

MonetDB: default - Proper count of dataflow blocks

2017-03-01 Thread Martin Kersten

Changeset: fcbbcb416c4f for MonetDB
URL: http://dev.monetdb.org/hg/MonetDB?cmd=changeset;node=fcbbcb416c4f
Modified Files:
monetdb5/optimizer/opt_dataflow.c
Branch: default
Log Message:

Proper count of dataflow blocks


diffs (25 lines):

diff --git a/monetdb5/optimizer/opt_dataflow.c 
b/monetdb5/optimizer/opt_dataflow.c
--- a/monetdb5/optimizer/opt_dataflow.c
+++ b/monetdb5/optimizer/opt_dataflow.c
@@ -210,9 +210,10 @@ OPTdataflowImplementation(Client cntxt, 
}
}
flowblock = newTmpVariable(mb,TYPE_bit);
-   q= newFcnCall(mb,languageRef,dataflowRef);\
-   q->barrier= BARRIERsymbol;\
-   getArg(q,0)= flowblock;\
+   q= newFcnCall(mb,languageRef,dataflowRef);
+   q->barrier= BARRIERsymbol;
+   getArg(q,0)= flowblock;
+   actions++;
}
//copyblock 
for( j=start ; jretc; k++)
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MonetDB: default - Merge with Dec2016 branch.

2017-03-01 Thread Sjoerd Mullender

Changeset: f054b7310be7 for MonetDB
URL: http://dev.monetdb.org/hg/MonetDB?cmd=changeset;node=f054b7310be7
Added Files:
monetdb5/modules/atoms/Tests/strappend.malC
monetdb5/modules/atoms/Tests/strappend.stable.err
monetdb5/modules/atoms/Tests/strappend.stable.out
Modified Files:
gdk/ChangeLog.Dec2016
gdk/gdk.h
gdk/gdk_batop.c
gdk/gdk_bbp.c
gdk/gdk_join.c
monetdb5/mal/mal_client.c
monetdb5/modules/atoms/Tests/All
monetdb5/optimizer/opt_pipes.c
sql/backends/monet5/sql_statistics.c
Branch: default
Log Message:

Merge with Dec2016 branch.

NOTE: YOUR DATABASES THAT YOU CREATED IN THE DEFAULT BRANCH CANNOT BE
USED.

In the Dec2016 branch the BBP version number was increased in order to
fix a bug where the empty string might occur with different offsets in
a duplicate-eliminated string heap.  This conflicts with a version
number increase that had been done in the default branch.  This means
that your default databases are now incompatible with the current
code.  Dump before you build, and restore after (or simply throw them
away).


diffs (truncated from 627 to 300 lines):

diff --git a/gdk/ChangeLog.Dec2016 b/gdk/ChangeLog.Dec2016
--- a/gdk/ChangeLog.Dec2016
+++ b/gdk/ChangeLog.Dec2016
@@ -1,3 +1,12 @@
 # ChangeLog file for MonetDB
 # This file is updated with Maddlog
 
+* Tue Feb 28 2017 Sjoerd Mullender 
+- Fixed a bug when appending string bats that are fully duplicate
+  eliminated.  It could happend that the to-be-appended bat had an empty
+  string at an offset and at that same offset in the to-be-appended-to bat
+  there happened to be a (sequence of) NULL(s).  Then this offset would be
+  used, even though it might nog be the right offset for the empty string
+  in the to-be-appended-to bat.  This would result in multiple offsets for
+  the empty string, breaking the promise of being duplicate eliminated.
+
diff --git a/gdk/gdk.h b/gdk/gdk.h
--- a/gdk/gdk.h
+++ b/gdk/gdk.h
@@ -854,8 +854,9 @@ typedef struct {
 #define GDKLIBRARY_INSERTED061032  /* inserted and deleted in BBP.dir */
 #define GDKLIBRARY_HEADED  061033  /* head properties are stored */
 #define GDKLIBRARY_NOKEY   061034  /* nokey values can't be trusted */
-#define GDKLIBRARY_TALIGN  061035  /* talign field in BBP.dir */
-#define GDKLIBRARY 061036
+#define GDKLIBRARY_BADEMPTY061035  /* possibility of duplicate empty str */
+#define GDKLIBRARY_TALIGN  061036  /* talign field in BBP.dir */
+#define GDKLIBRARY 061037
 
 typedef struct BAT {
/* static bat properties */
diff --git a/gdk/gdk_batop.c b/gdk/gdk_batop.c
--- a/gdk/gdk_batop.c
+++ b/gdk/gdk_batop.c
@@ -301,10 +301,13 @@ insert_string_bat(BAT *b, BAT *n, BAT *s
}
bunfastapp(b, tp);
}
-   } else if (b->tvheap->free < n->tvheap->free / 2) {
+   } else if (b->tvheap->free < n->tvheap->free / 2 ||
+  GDK_ELIMDOUBLES(b->tvheap)) {
/* if b's string heap is much smaller than n's string
 * heap, don't bother checking whether n's string
-* values occur in b's string heap */
+* values occur in b's string heap; also, if b is
+* (still) fully double eliminated, we must continue
+* to use the double elimination mechanism */
r = BUNlast(b);
if (cand) {
oid hseq = n->hseqbase;
diff --git a/gdk/gdk_bbp.c b/gdk/gdk_bbp.c
--- a/gdk/gdk_bbp.c
+++ b/gdk/gdk_bbp.c
@@ -629,6 +629,287 @@ fixwkbheap(void)
 }
 #endif
 
+#ifdef GDKLIBRARY_BADEMPTY
+/* There was a bug (fixed in changeset 1f5498568a24) which could
+ * result in empty strings not being double-eliminated.  This code
+ * fixes the affected bats.
+ * Note that we only fix BATs whose string heap is still fully double
+ * eliminated. */
+static inline int
+offsearch(const int *restrict offsets, int noffsets, int val)
+{
+   /* binary search on offsets for val, return whether present */
+   int lo = 0, hi = noffsets - 1, mid;
+
+   while (hi > lo) {
+   mid = (lo + hi) / 2;
+   if (offsets[mid] == val)
+   return 1;
+   if (offsets[mid] < val)
+   lo = mid + 1;
+   else
+   hi = mid - 1;
+   }
+   return offsets[lo] == val;
+}
+
+static void
+fixstroffheap(BAT *b, int *restrict offsets)
+{
+   long_str filename;
+   Heap h1;/* old offset heap */
+   Heap h2;/* new string heap */
+   Heap h3;/* new offset heap */
+   Heap *h;/* string heap */
+   int noffsets = 0;
+   const size_t extralen = b->tvheap->hashash ? EXTRALEN : 0;
+   size_t pos;
+   var_t emptyoff = 0;
+   const char *nme, *bnme;
+   char *srcdir;
+

MonetDB: Dec2016 - Better check to see whether join result is em...

2017-03-01 Thread Sjoerd Mullender

Changeset: 310b7a4f966d for MonetDB
URL: http://dev.monetdb.org/hg/MonetDB?cmd=changeset;node=310b7a4f966d
Modified Files:
gdk/gdk_join.c
Branch: Dec2016
Log Message:

Better check to see whether join result is empty.

This fixes bug 6237.


diffs (94 lines):

diff --git a/gdk/gdk_join.c b/gdk/gdk_join.c
--- a/gdk/gdk_join.c
+++ b/gdk/gdk_join.c
@@ -117,10 +117,17 @@ joininitresults(BAT **r1p, BAT **r2p, BU
*r1p = NULL;
if (r2p)
*r2p = NULL;
-   if (rkey | semi | only_misses) {
+   if (lcnt == 0) {
+   /* there is nothing to match */
+   maxsize = 0;
+   } else if (!only_misses && !nil_on_miss && rcnt == 0) {
+   /* if right is empty, we have no hits, so if we don't
+* want misses, the result is empty */
+   maxsize = 0;
+   } else if (rkey | semi | only_misses) {
/* each entry left matches at most one on right, in
 * case nil_on_miss is also set, each entry matches
-* exactly one */
+* exactly one (see below) */
maxsize = lcnt;
} else if (lkey) {
/* each entry on right is matched at most once */
@@ -149,6 +156,25 @@ joininitresults(BAT **r1p, BAT **r2p, BU
size = maxsize;
}
 
+   if (maxsize == 0) {
+   r1 = COLnew(0, TYPE_void, 0, TRANSIENT);
+   if (r1 == NULL) {
+   return BUN_NONE;
+   }
+   BATtseqbase(r1, 0);
+   if (r2p) {
+   r2 = COLnew(0, TYPE_void, 0, TRANSIENT);
+   if (r2 == NULL) {
+   BBPreclaim(r1);
+   return BUN_NONE;
+   }
+   BATtseqbase(r2, 0);
+   *r2p = r2;
+   }
+   *r1p = r1;
+   return 0;
+   }
+
r1 = COLnew(0, TYPE_oid, size, TRANSIENT);
if (r1 == NULL) {
return BUN_NONE;
@@ -3797,6 +3823,8 @@ subleftjoin(BAT **r1p, BAT **r2p, BAT *l
*r1p = r1;
if (r2p)
*r2p = r2;
+   if (maxsize == 0)
+   return GDK_SUCCEED;
if (BATtdense(r) && (sr == NULL || BATtdense(sr)) && lcount > 0 && 
rcount > 0) {
/* use special implementation for dense right-hand side */
return mergejoin_void(r1, r2, l, r, sl, sr,
@@ -3907,6 +3935,8 @@ BATthetajoin(BAT **r1p, BAT **r2p, BAT *
return GDK_FAIL;
*r1p = r1;
*r2p = r2;
+   if (maxsize == 0)
+   return GDK_SUCCEED;
 
return thetajoin(r1, r2, l, r, sl, sr, opcode, maxsize, t0);
 }
@@ -3957,6 +3987,8 @@ BATjoin(BAT **r1p, BAT **r2p, BAT *l, BA
return GDK_FAIL;
*r1p = r1;
*r2p = r2;
+   if (maxsize == 0)
+   return GDK_SUCCEED;
swap = 0;
 
/* some statistics to help us decide */
@@ -4085,6 +4117,8 @@ BATbandjoin(BAT **r1p, BAT **r2p, BAT *l
return GDK_FAIL;
*r1p = r1;
*r2p = r2;
+   if (maxsize == 0)
+   return GDK_SUCCEED;
 
return bandjoin(r1, r2, l, r, sl, sr, c1, c2, li, hi, maxsize, t0);
 }
@@ -4104,6 +4138,8 @@ BATrangejoin(BAT **r1p, BAT **r2p, BAT *
return GDK_FAIL;
*r1p = r1;
*r2p = r2;
+   if (maxsize == 0)
+   return GDK_SUCCEED;
 
/* note, the rangejoin implementation is in gdk_select.c since
 * it uses the imprints code there */
___
checkin-list mailing list
checkin-list@monetdb.org
https://www.monetdb.org/mailman/listinfo/checkin-list

MonetDB: Dec2016 - Improved fix for fixing duplicate empty strings.

2017-03-01 Thread Sjoerd Mullender

Changeset: 69603b650998 for MonetDB
URL: http://dev.monetdb.org/hg/MonetDB?cmd=changeset;node=69603b650998
Modified Files:
gdk/gdk_bbp.c
Branch: Dec2016
Log Message:

Improved fix for fixing duplicate empty strings.
See changesets 1f5498568a24 and 0c475cc54c60.


diffs (221 lines):

diff --git a/gdk/gdk_bbp.c b/gdk/gdk_bbp.c
--- a/gdk/gdk_bbp.c
+++ b/gdk/gdk_bbp.c
@@ -897,13 +897,18 @@ fixstroffheap(BAT *b, int *restrict offs
 {
long_str filename;
Heap h1;/* old offset heap */
+   Heap h2;/* new string heap */
+   Heap h3;/* new offset heap */
Heap *h;/* string heap */
int noffsets = 0;
const size_t extralen = b->tvheap->hashash ? EXTRALEN : 0;
-   size_t pos, emptyoff = 0;
+   size_t pos;
+   var_t emptyoff = 0;
const char *nme, *bnme;
char *srcdir;
BUN i;
+   int width;
+   int nofix = 1;
 
assert(GDK_ELIMDOUBLES(b->tvheap));
 
@@ -930,31 +935,64 @@ fixstroffheap(BAT *b, int *restrict offs
pos += pad + extralen;
s = h->base + pos;
if (*s == '\0')
-   emptyoff = pos;
+   emptyoff = (var_t) pos;
offsets[noffsets++] = (int) pos; /* < 65536, i.e. fits */
pos += GDK_STRLEN(s);
}
HEAPfree(b->tvheap, 0);
-   if (emptyoff == 0) {
-   /* no empty string encountered in the heap, so the bug
-* is extremely unlikely to have occurred (we need an
-* area of zero bytes that is aligned on a var_t
-* boundary and two var_t's long -- in the absence of
-* an empty string, this can only happen if hashash is
-* set and a string hashes to zero) */
-   GDKfree(srcdir);
-   return;
-   }
 
if ((bnme = strrchr(nme, DIR_SEP)) != NULL)
bnme++;
else
bnme = nme;
sprintf(filename, "BACKUP%c%s", DIR_SEP, bnme);
+
+   width = b->twidth;
+   h2.dirty = 0;
+   if (emptyoff == 0) {
+   /* no legitimate empty string in the string heap; we
+* now make a backup of the old string heap and create
+* a new one to which we add an empty string */
+   h2 = *b->tvheap;
+   if (GDKmove(h2.farmid, srcdir, bnme, "theap", BAKDIR, bnme, 
"theap") != GDK_SUCCEED)
+   GDKfatal("fixstroffheap: cannot make backup of 
%s.theap\n", nme);
+   h2.filename = GDKfilepath(NOFARM, NULL, nme, "theap");
+   if (h2.filename == NULL)
+   GDKfatal("fixstroffheap: GDKmalloc failed\n");
+   h2.base = NULL;
+   if (HEAPalloc(, h2.size, 1) != GDK_SUCCEED)
+   GDKfatal("fixstroffheap: allocating new string heap "
+"for BAT %d failed\n", b->batCacheid);
+   h2.cleanhash = b->tvheap->cleanhash;
+   h2.hashash = b->tvheap->hashash;
+   h2.free = b->tvheap->free;
+   /* load old offset heap and copy contents to new heap */
+   h1 = *b->tvheap;
+   h1.filename = NULL;
+   h1.base = NULL;
+   h1.dirty = 0;
+   if (HEAPload(, filename, "theap", 0) != GDK_SUCCEED)
+   GDKfatal("fixstroffheap: loading old tail heap "
+"for BAT %d failed\n", b->batCacheid);
+   memcpy(h2.base, h1.base, h2.free);
+   HEAPfree(, 0);
+   h2.dirty = 1;
+   if ((*BATatoms[TYPE_str].atomPut)(, , "") == 0)
+   GDKfatal("fixstroffheap: cannot insert empty string "
+"in BAT %d failed\n", b->batCacheid);
+   /* if the offset of the new empty string doesn't fit
+* in the offset heap (too many bits for the current
+* width), we will also make the new offset heap
+* wider */
+   if ((width <= 2 ? emptyoff - GDK_VAROFFSET : emptyoff) >= 
(var_t) (1 << (width * 8))) {
+   width <<= 1;
+   assert((width <= 2 ? emptyoff - GDK_VAROFFSET : 
emptyoff) < (var_t) (1 << (width * 8)));
+   }
+   }
+
+   /* make backup of offset heap */
if (GDKmove(b->theap.farmid, srcdir, bnme, "tail", BAKDIR, bnme, 
"tail") != GDK_SUCCEED)
GDKfatal("fixstroffheap: cannot make backup of %s.tail\n", nme);
-   GDKfree(srcdir);
-
/* load old offset heap */
h1 = b->theap;
h1.filename = NULL;
@@ -965,58 +1003,98 @@ fixstroffheap(BAT *b, int *restrict offs
 "for BAT %d failed\n", b->batCacheid);
 
/* create new offset heap */
-   b->theap.filename = GDKfilepath(NOFARM, NULL, nme,

MonetDB: wlcr - Remove everything related to the master-replica ...

2017-03-01 Thread Panagiotis Koutsourakis

Changeset: bb12643ccbf0 for MonetDB
URL: http://dev.monetdb.org/hg/MonetDB?cmd=changeset;node=bb12643ccbf0
Modified Files:
tools/merovingian/client/monetdb.c
tools/merovingian/daemon/controlrunner.c
tools/merovingian/utils/database.c
tools/merovingian/utils/database.h
Branch: wlcr
Log Message:

Remove everything related to the master-replica commands

The snapshots will be handled by the server itself.


diffs (201 lines):

diff --git a/tools/merovingian/client/monetdb.c 
b/tools/merovingian/client/monetdb.c
--- a/tools/merovingian/client/monetdb.c
+++ b/tools/merovingian/client/monetdb.c
@@ -1620,63 +1620,6 @@ command_release(int argc, char *argv[])
simple_command(argc, argv, "release", "taken database out of 
maintenance mode", 1);
 }
 
-static void
-command_master(int argc, char *argv[])
-{
-   char *e = NULL;
-   sabdb *orig = NULL;
-   sabdb *stats = NULL;
-   char *target_path = NULL;
-
-
-   if (argc != 2 && argc != 3) {
-   /* print help message for this command */
-   command_help(argc + 1, [-1]);
-   exit(1);
-   }
-
-   if (argc == 3) {
-   target_path = strdup(argv[2]);
-   argv[2] = NULL;
-   }
-
-   if ((e = MEROgetStatus(, NULL)) != NULL) {
-   fprintf(stderr, "master: %s\n", e);
-   free(e);
-   exit(2);
-   }
-   stats = globMatchDBS(argc, argv, , "master");
-   msab_freeStatus();
-   orig = stats;
-
-   if (target_path != NULL) {
-   size_t len = strlen("master path=") + strlen(target_path) + 1;
-   char *cmd = (char *)malloc(len);
-   snprintf(cmd, len, "master path=%s", target_path);
-   simple_argv_cmd(argv[0], orig, cmd,
-   "set database as master", NULL);
-   free(target_path);
-   free(cmd);
-   } else {
-   simple_argv_cmd(argv[0], orig, "master",
-   "set database as master", NULL);
-   }
-}
-
-static void
-command_replica(int argc, char *argv[])
-{
-   int i;
-   if (argc != 3) {
-   /* print help message for this command */
-   command_help(argc + 1, [-1]);
-   exit(1);
-   }
-   fprintf(stderr, "Called replica with %d args:\n", argc);
-   for (i = 0; i < argc; i++)
-   fprintf(stderr, "  %s\n", argv[i]);
-}
-
 int
 main(int argc, char *argv[])
 {
@@ -1870,10 +1813,6 @@ main(int argc, char *argv[])
command_set(argc - i, [i], INHERIT);
} else if (strcmp(argv[i], "discover") == 0) {
command_discover(argc - i, [i]);
-   } else if (strcmp(argv[i], "master") == 0) {
-   command_master(argc - i, [i]);
-   } else if (strcmp(argv[i], "replica") == 0) {
-   command_replica(argc - i, [i]);
} else {
fprintf(stderr, "monetdb: unknown command: %s\n", argv[i]);
command_help(0, NULL);
diff --git a/tools/merovingian/daemon/controlrunner.c 
b/tools/merovingian/daemon/controlrunner.c
--- a/tools/merovingian/daemon/controlrunner.c
+++ b/tools/merovingian/daemon/controlrunner.c
@@ -618,21 +618,6 @@ static void ctl_handle_client(
len = snprintf(buf2, sizeof(buf2), 
"OK\n");
send_client("=");
}
-   } else if (strcmp(p, "master") == 0 ||
-  strncmp(p, "master path=", 
strlen("master path=")) == 0) {
-   char *e = db_master(q);
-   if (e != NULL) {
-   Mfprintf(_mero_ctlerr, "%s: got command 
master %s: %s\n", origin, q, getErrMsg(e));
-   len = snprintf(buf2, sizeof(buf2),
-  "%s\n", 
getErrMsg(e));
-   send_client("!");
-   free(e);
-   } else {
-   Mfprintf(_mero_ctlout, "%s: set 
database '%s' to master mode\n",
-origin, q);
-   len = snprintf(buf2, sizeof(buf2), 
"OK\n");
-   send_client("=");
-   }
} else if (strncmp(p, "name=", strlen("name=")) == 0) {
char *e;
 
diff --git a/tools/merovingian/utils/database.c 
b/tools/merovingian/utils/database.c
--- a/tools/merovingian/utils/database.c
+++ b/tools/merovingian/utils/database.c
@@ -373,84 +373,3 @@ char *db_release(char *dbname) {
 
return(NULL);
 }
-
-/*
- * The following functions require rsync

MonetDB: Dec2016 - Fix string BAT that contain non-double-elimin...

2017-03-01 Thread Sjoerd Mullender

Changeset: 0c475cc54c60 for MonetDB
URL: http://dev.monetdb.org/hg/MonetDB?cmd=changeset;node=0c475cc54c60
Modified Files:
gdk/gdk.h
gdk/gdk_bbp.c
Branch: Dec2016
Log Message:

Fix string BAT that contain non-double-eliminated empty strings.
This bug was fixed in changeset 1f5498568a24, here we fix the old BATs
that were affected.


diffs (245 lines):

diff --git a/gdk/gdk.h b/gdk/gdk.h
--- a/gdk/gdk.h
+++ b/gdk/gdk.h
@@ -858,7 +858,8 @@ typedef struct {
 #define GDKLIBRARY_INSERTED061032  /* inserted and deleted in BBP.dir */
 #define GDKLIBRARY_HEADED  061033  /* head properties are stored */
 #define GDKLIBRARY_NOKEY   061034  /* nokey values can't be trusted */
-#define GDKLIBRARY 061035
+#define GDKLIBRARY_BADEMPTY061035  /* possibility of duplicate empty str */
+#define GDKLIBRARY 061036
 
 typedef struct BAT {
/* static bat properties */
diff --git a/gdk/gdk_bbp.c b/gdk/gdk_bbp.c
--- a/gdk/gdk_bbp.c
+++ b/gdk/gdk_bbp.c
@@ -868,6 +868,209 @@ fixwkbheap(void)
 }
 #endif
 
+#ifdef GDKLIBRARY_BADEMPTY
+/* There was a bug (fixed in changeset 1f5498568a24) which could
+ * result in empty strings not being double-eliminated.  This code
+ * fixes the affected bats.
+ * Note that we only fix BATs whose string heap is still fully double
+ * eliminated. */
+static inline int
+offsearch(const int *restrict offsets, int noffsets, int val)
+{
+   /* binary search on offsets for val, return whether present */
+   int lo = 0, hi = noffsets - 1, mid;
+
+   while (hi > lo) {
+   mid = (lo + hi) / 2;
+   if (offsets[mid] == val)
+   return 1;
+   if (offsets[mid] < val)
+   lo = mid + 1;
+   else
+   hi = mid - 1;
+   }
+   return offsets[lo] == val;
+}
+
+static void
+fixstroffheap(BAT *b, int *restrict offsets)
+{
+   long_str filename;
+   Heap h1;/* old offset heap */
+   Heap *h;/* string heap */
+   int noffsets = 0;
+   const size_t extralen = b->tvheap->hashash ? EXTRALEN : 0;
+   size_t pos, emptyoff = 0;
+   const char *nme, *bnme;
+   char *srcdir;
+   BUN i;
+
+   assert(GDK_ELIMDOUBLES(b->tvheap));
+
+   nme = BBP_physical(b->batCacheid);
+   srcdir = GDKfilepath(NOFARM, BATDIR, nme, NULL);
+   if (srcdir == NULL)
+   GDKfatal("fixstroffheap: GDKmalloc failed\n");
+   *strrchr(srcdir, DIR_SEP) = 0;
+
+   /* load string heap */
+   if (HEAPload(b->tvheap, nme, "theap", 0) != GDK_SUCCEED)
+   GDKfatal("fixstroffheap: loading string (theap) heap "
+"for BAT %d failed\n", b->batCacheid);
+   h = b->tvheap;  /* abbreviation */
+   /* collect valid offsets */
+   pos = GDK_STRHASHSIZE;
+   while (pos < h->free) {
+   const char *s;
+   size_t pad;
+
+   pad = GDK_VARALIGN - (pos & (GDK_VARALIGN - 1));
+   if (pad < sizeof(stridx_t))
+   pad += GDK_VARALIGN;
+   pos += pad + extralen;
+   s = h->base + pos;
+   if (*s == '\0')
+   emptyoff = pos;
+   offsets[noffsets++] = (int) pos; /* < 65536, i.e. fits */
+   pos += GDK_STRLEN(s);
+   }
+   HEAPfree(b->tvheap, 0);
+   if (emptyoff == 0) {
+   /* no empty string encountered in the heap, so the bug
+* is extremely unlikely to have occurred (we need an
+* area of zero bytes that is aligned on a var_t
+* boundary and two var_t's long -- in the absence of
+* an empty string, this can only happen if hashash is
+* set and a string hashes to zero) */
+   GDKfree(srcdir);
+   return;
+   }
+
+   if ((bnme = strrchr(nme, DIR_SEP)) != NULL)
+   bnme++;
+   else
+   bnme = nme;
+   sprintf(filename, "BACKUP%c%s", DIR_SEP, bnme);
+   if (GDKmove(b->theap.farmid, srcdir, bnme, "tail", BAKDIR, bnme, 
"tail") != GDK_SUCCEED)
+   GDKfatal("fixstroffheap: cannot make backup of %s.tail\n", nme);
+   GDKfree(srcdir);
+
+   /* load old offset heap */
+   h1 = b->theap;
+   h1.filename = NULL;
+   h1.base = NULL;
+   h1.dirty = 0;
+   if (HEAPload(, filename, "tail", 0) != GDK_SUCCEED)
+   GDKfatal("fixstroffheap: loading old tail heap "
+"for BAT %d failed\n", b->batCacheid);
+
+   /* create new offset heap */
+   b->theap.filename = GDKfilepath(NOFARM, NULL, nme, "tail");
+   if (b->theap.filename == NULL)
+   GDKfatal("fixstroffheap: GDKmalloc failed\n");
+   if (HEAPalloc(>theap, b->batCapacity, b->twidth) != GDK_SUCCEED)
+   GDKfatal("fixstroffheap: allocating new tail heap "
+

MonetDB: default - Stop storing string hashes in string heaps.

2017-03-01 Thread Sjoerd Mullender

Changeset: 7fa0ede6314b for MonetDB
URL: http://dev.monetdb.org/hg/MonetDB?cmd=changeset;node=7fa0ede6314b
Modified Files:
gdk/gdk_atoms.c
Branch: default
Log Message:

Stop storing string hashes in string heaps.
This change has no effect on existing string heaps.  It only affects
new ones.


diffs (12 lines):

diff --git a/gdk/gdk_atoms.c b/gdk/gdk_atoms.c
--- a/gdk/gdk_atoms.c
+++ b/gdk/gdk_atoms.c
@@ -1108,7 +1108,7 @@ strHeap(Heap *d, size_t cap)
d->free = GDK_STRHASHTABLE * sizeof(stridx_t);
d->dirty = 1;
memset(d->base, 0, d->free);
-   d->hashash = 1; /* new string heaps get the hash value (and 
length) stored */
+   d->hashash = 0;
 #ifndef NDEBUG
/* fill should solve initialization problems within valgrind */
memset(d->base + d->free, 0, d->size - d->free);
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MonetDB: default - Approve output

MonetDB: default - Add thetaselect and bat updates

MonetDB: Dec2016 - Fix or crash reported in bug 6220.

MonetDB: default - Simplify code for debugging

MonetDB: default - Push aside incomplete code

MonetDB: default - Approve output

MonetDB: default - Proper count of dataflow blocks

MonetDB: default - Merge with Dec2016 branch.

MonetDB: Dec2016 - Better check to see whether join result is em...

MonetDB: Dec2016 - Improved fix for fixing duplicate empty strings.

MonetDB: wlcr - Remove everything related to the master-replica ...

MonetDB: Dec2016 - Fix string BAT that contain non-double-elimin...

MonetDB: default - Stop storing string hashes in string heaps.

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