Added array_sum expression function

resources/function_help/json/array_sum

@@ -0,0 +1,10 @@
+{
+  "name": "array_sum",
+  "type": "function",
+  "groups": ["Arrays"],
+  "description": "Returns the sum of arithmetic values in an array. Non numeric values in the array are ignored.",
+  "arguments": [ {"arg":"array","description":"an array"} ],
+  "examples": [ 
+    { "expression":"array_sum(array(0,1,39.4,1.6,'a'))", "returns":"42.0"}
+  ]
+}

src/core/expression/qgsexpressionfunction.cpp

@@ -5424,6 +5424,29 @@ static QVariant fcnArrayMajority( const QVariantList &values, const QgsExpressio
   return list.isEmpty() ? QVariant() : hash.keys( maxValue );
 }
 
+static QVariant fcnArraySum( const QVariantList &values, const QgsExpressionContext *, QgsExpression *parent, const QgsExpressionNodeFunction * )
+{
+  const QVariantList list = QgsExpressionUtils::getListValue( values.at( 0 ), parent );
+  int i = 0;
+  double total = 0.0;
+  for ( const auto &item : list )
+  {
+    switch ( item.userType() )
+    {
+      case QMetaType::Int:
+      case QMetaType::UInt:
+      case QMetaType::LongLong:
+      case QMetaType::ULongLong:
+      case QMetaType::Float:
+      case QMetaType::Double:
+        total += item.toDouble();
+        ++i;
+        break;
+    }
+  }
+  return i == 0 ? QVariant() : total;
+}
+
 static QVariant convertToSameType( const QVariant &value, QVariant::Type type )
 {
   QVariant result = value;
@@ -7034,6 +7057,7 @@ const QList<QgsExpressionFunction *> &QgsExpression::Functions()
         << new QgsStaticExpressionFunction( QStringLiteral( "array_mean" ), QgsExpressionFunction::ParameterList() << QgsExpressionFunction::Parameter( QStringLiteral( "array" ) ), fcnArrayMean, QStringLiteral( "Arrays" ) )
         << new QgsStaticExpressionFunction( QStringLiteral( "array_median" ), QgsExpressionFunction::ParameterList() << QgsExpressionFunction::Parameter( QStringLiteral( "array" ) ), fcnArrayMedian, QStringLiteral( "Arrays" ) )
         << new QgsStaticExpressionFunction( QStringLiteral( "array_majority" ), QgsExpressionFunction::ParameterList() << QgsExpressionFunction::Parameter( QStringLiteral( "array" ) ), fcnArrayMajority, QStringLiteral( "Arrays" ) )
+        << new QgsStaticExpressionFunction( QStringLiteral( "array_sum" ), QgsExpressionFunction::ParameterList() << QgsExpressionFunction::Parameter( QStringLiteral( "array" ) ), fcnArraySum, QStringLiteral( "Arrays" ) )
         << new QgsStaticExpressionFunction( QStringLiteral( "array_append" ), QgsExpressionFunction::ParameterList() << QgsExpressionFunction::Parameter( QStringLiteral( "array" ) ) << QgsExpressionFunction::Parameter( QStringLiteral( "value" ) ), fcnArrayAppend, QStringLiteral( "Arrays" ) )
         << new QgsStaticExpressionFunction( QStringLiteral( "array_prepend" ), QgsExpressionFunction::ParameterList() << QgsExpressionFunction::Parameter( QStringLiteral( "array" ) ) << QgsExpressionFunction::Parameter( QStringLiteral( "value" ) ), fcnArrayPrepend, QStringLiteral( "Arrays" ) )
         << new QgsStaticExpressionFunction( QStringLiteral( "array_insert" ), QgsExpressionFunction::ParameterList() << QgsExpressionFunction::Parameter( QStringLiteral( "array" ) ) << QgsExpressionFunction::Parameter( QStringLiteral( "pos" ) ) << QgsExpressionFunction::Parameter( QStringLiteral( "value" ) ), fcnArrayInsert, QStringLiteral( "Arrays" ) )

tests/src/core/testqgsexpression.cpp

@@ -1640,7 +1640,7 @@ class TestQgsExpression: public QObject
       QTest::newRow( "array_last(array('a', 'b', 'c'))" ) << QStringLiteral( "array_last(array('a', 'b', 'c'))" ) << false << QVariant( "c" );
       QTest::newRow( "array_last(array())" ) << QStringLiteral( "array_last(array())" ) << false << QVariant();
 
-      // array_min, array_max, array_mean, array_median, array_majority
+      // array_min, array_max, array_mean, array_median, array_majority, array_sum
       QTest::newRow( "array_min(array())" ) << QStringLiteral( "array_min(array())" ) << false << QVariant();
       QTest::newRow( "array_min(array(-1, 0, 1, 2))" ) << QStringLiteral( "array_min(array(-1, 0, 1, 2))" ) << false << QVariant( -1 );
       QTest::newRow( "array_min(array(make_date(2020,12,11),make_date(2020,12,12),make_date(2020,12,13)))" ) << QStringLiteral( "array_min(array(make_date(2020,12,11),make_date(2020,12,12),make_date(2020,12,13)))" ) << false << QVariant( QDate( 2020, 12, 11 ) );
@@ -1655,6 +1655,9 @@ class TestQgsExpression: public QObject
       QTest::newRow( "array_median(array(0,0,1,2,2,42,'a','b'))" ) << QStringLiteral( "array_median(array(0,0,1,2,2,42,'a','b'))" ) << false << QVariant( 1.5 );
       QTest::newRow( "array_majority(array())" ) << QStringLiteral( "array_majority(array())" ) << false << QVariant();
       QTest::newRow( "array_majority(array(1,2,42,42,'a','b'))" ) << QStringLiteral( "array_majority(array(1,2,42,42,'a','b'))" ) << false << QVariant( QVariantList() << 42 );
+      QTest::newRow( "array_sum(array())" ) << QStringLiteral( "array_mean(array())" ) << false << QVariant();
+      QTest::newRow( "array_sum(array('a','b','c'))" ) << QStringLiteral( "array_mean(array('a','b','c'))" ) << false << QVariant();
+      QTest::newRow( "array_sum(array(0,1,39.4,1.6,'a'))" ) << QStringLiteral( "array_mean(array(0,1,39.4,1.6,'a'))" ) << false << QVariant( 42.0 );
 
       // file functions
       QTest::newRow( "base_file_name(5)" ) << QStringLiteral( "base_file_name(5)" ) << false << QVariant( "5" );