fix #1896

sh/checkStyle.sh

@@ -16,7 +16,7 @@ cd "$(git rev-parse --show-toplevel)"
 
 # Find all changed files in the diff
 for f in $(git diff --name-only --diff-filter=ACMRTUXB $1); do
-  if echo "$f" | egrep -q "[.](cpp|h)$"; then
+  if echo "$f" | grep -E -q "[.](cpp|h)$"; then
     $CLANGFORMAT -style=file "$f" -i
     d=$(git diff --minimal --color=always --ws-error-highlight=all $f) || true
     if [ -n "$d" ]; then
@@ -27,7 +27,7 @@ for f in $(git diff --name-only --diff-filter=ACMRTUXB $1); do
       echo
       fail=1
     fi
-  elif echo "$f" | egrep -q "[.](dl)$"; then
+  elif echo "$f" | grep -E -q "[.](dl)$"; then
     sed -i 's/[ \t]*$//' "$f" || true
     d=$(git diff --minimal --color=always --ws-error-highlight=all $f) || true
     if [ -n "$d" ]; then

src/ast/Aggregator.cpp

@@ -27,9 +27,11 @@ std::vector<Literal*> Aggregator::getBodyLiterals() const {
     return toPtrVector(body);
 }
 
-void Aggregator::setBodyLiterals(VecOwn<Literal> bodyLiterals) {
+VecOwn<Literal> Aggregator::setBodyLiterals(VecOwn<Literal> bodyLiterals) {
     assert(allValidPtrs(body));
+    auto oldBody = std::move(body);
     body = std::move(bodyLiterals);
+    return oldBody;
 }
 
 void Aggregator::apply(const NodeMapper& map) {

src/ast/Aggregator.h

@@ -52,8 +52,8 @@ class Aggregator : public Argument {
     /** Return body literals */
     std::vector<Literal*> getBodyLiterals() const;
 
-    /** Set body literals */
-    void setBodyLiterals(VecOwn<Literal> bodyLiterals);
+    /** Set body literals, returns previous body literals */
+    VecOwn<Literal> setBodyLiterals(VecOwn<Literal> bodyLiterals);
 
     void apply(const NodeMapper& map) override;
 

src/ast/transform/MaterializeAggregationQueries.cpp

@@ -272,6 +272,9 @@ bool MaterializeAggregationQueriesTransformer::materializeAggregationQueries(
         return true;
     });
 
+    // keep literals alive while we use the type analysis, issue (#1896).
+    VecOwn<Literal> oldBodyLiterals;
+
     for (auto&& cl : program.getClauses()) {
         auto& clause = *cl;
         visit(clause, [&](Aggregator& agg) {
@@ -345,7 +348,9 @@ bool MaterializeAggregationQueriesTransformer::materializeAggregationQueries(
 
             VecOwn<Literal> newBody;
             newBody.push_back(std::move(aggAtom));
-            agg.setBodyLiterals(std::move(newBody));
+            VecOwn<Literal> oldBody = agg.setBodyLiterals(std::move(newBody));
+            oldBodyLiterals.insert(oldBodyLiterals.end(), std::make_move_iterator(oldBody.begin()),
+                    std::make_move_iterator(oldBody.end()));
             // Now we can just add these new things (relation and its single clause) to the program
             program.addClause(std::move(aggClause));
             program.addRelation(std::move(aggRel));

tests/semantic/CMakeLists.txt

@@ -270,3 +270,4 @@ souffle_positive_functor_test(issue2373 CATEGORY semantic)
 negative_test(error_deduce_type)
 positive_output_stdout_test(output_stdout)
 positive_test(iteration_counter)
+positive_test(issue1896)

tests/semantic/issue1896/issue1896.dl

@@ -0,0 +1,12 @@
+.decl wisb(A:symbol, B:number)
+.decl fwnb(A:symbol)
+.decl ocfz(A:symbol, B:number)
+.decl folv(A:symbol, B:symbol)
+.decl linj(A:number)
+.decl epce(A:symbol, B:symbol, C:symbol)
+.decl utfi(A:symbol, B:number, C:symbol)
+
+linj(A) :- wisb(B, A), A > min AAA : { wisb(CCC, AAA), wisb(BBB, AAA), fwnb(BBB), to_number("-10") = AAA}.
+utfi(C, min(A*A*A,0), B), folv(B, B), ocfz(B, A) :- linj(A), fwnb(C), epce(C, B, B),  A = count : {epce(AAA, AAA, AAA), AxF="GnBBBBB", AAA=substr(AxF,0,1)}.
+.output utfi()
+.output linj()

tests/semantic/issue1896/issue1896.err

@@ -0,0 +1,15 @@
+Warning: No rules/facts defined for relation wisb in file issue1896.dl at line 1
+.decl wisb(A:symbol, B:number)
+------^------------------------
+Warning: No rules/facts defined for relation fwnb in file issue1896.dl at line 2
+.decl fwnb(A:symbol)
+------^--------------
+Warning: No rules/facts defined for relation epce in file issue1896.dl at line 6
+.decl epce(A:symbol, B:symbol, C:symbol)
+------^----------------------------------
+Warning: Variable B only occurs once in file issue1896.dl at line 9
+linj(A) :- wisb(B, A), A > min AAA : { wisb(CCC, AAA), wisb(BBB, AAA), fwnb(BBB), to_number("-10") = AAA}.
+----------------^------------------------------------------------------------------------------------------
+Warning: Variable CCC only occurs once in file issue1896.dl at line 9
+linj(A) :- wisb(B, A), A > min AAA : { wisb(CCC, AAA), wisb(BBB, AAA), fwnb(BBB), to_number("-10") = AAA}.
+--------------------------------------------^--------------------------------------------------------------