Compile some supported functions for spatialite provider

Author: nyalldawson

src/core/qgssqliteexpressioncompiler.cpp

@@ -84,6 +84,25 @@ QString QgsSQLiteExpressionCompiler::quotedValue( const QVariant& value, bool& o
   }
 }
 
+static const QMap<QString, QString>& functionNamesSqlFunctionsMap()
+{
+  static QMap<QString, QString> fnNames;
+  if ( fnNames.isEmpty() )
+  {
+    fnNames =
+    {
+      { "abs", "abs" },
+      { "round", "round" }
+    };
+  }
+  return fnNames;
+}
+
+QString QgsSQLiteExpressionCompiler::sqlFunctionFromFunctionName( const QString& fnName ) const
+{
+  return functionNamesSqlFunctionsMap().value( fnName, QString() );
+}
+
 QString QgsSQLiteExpressionCompiler::castToReal( const QString& value ) const
 {
   return QStringLiteral( "CAST((%1) AS REAL)" ).arg( value );

src/core/qgssqliteexpressioncompiler.h

@@ -44,6 +44,7 @@ class CORE_EXPORT QgsSQLiteExpressionCompiler : public QgsSqlExpressionCompiler
     virtual Result compileNode( const QgsExpression::Node* node, QString& str ) override;
     virtual QString quotedIdentifier( const QString& identifier ) override;
     virtual QString quotedValue( const QVariant& value, bool& ok ) override;
+    virtual QString sqlFunctionFromFunctionName( const QString& fnName ) const override;
     virtual QString castToReal( const QString& value ) const override;
     virtual QString castToInt( const QString& value ) const override;
 

tests/src/python/providertestbase.py

@@ -243,6 +243,7 @@ def runGetFeatureTests(self, provider):
         self.assert_query(provider, 'log(3, pk) <= 1', [1, 2, 3])
         self.assert_query(provider, 'log10(pk) < 0.5', [1, 2, 3])
         self.assert_query(provider, 'round(3.14) <= pk', [3, 4, 5])
+        self.assert_query(provider, 'round(0.314,1) * 10 = pk', [3])
         self.assert_query(provider, 'floor(3.14) <= pk', [3, 4, 5])
         self.assert_query(provider, 'ceil(3.14) <= pk', [4, 5])
         self.assert_query(provider, 'pk < pi()', [1, 2, 3])

tests/src/python/test_provider_shapefile.py

@@ -147,6 +147,7 @@ def uncompiledFilters(self):
                        'log(3, pk) <= 1',
                        'log10(pk) < 0.5',
                        'round(3.14) <= pk',
+                       'round(0.314,1) * 10 = pk',
                        'floor(3.14) <= pk',
                        'ceil(3.14) <= pk',
                        'pk < pi()',

tests/src/python/test_provider_spatialite.py

@@ -197,7 +197,6 @@ def uncompiledFilters(self):
                     'sqrt(pk) >= 2',
                     'radians(cnt) < 2',
                     'degrees(pk) <= 200',
-                    'abs(cnt) <= 200',
                     'cos(pk) < 0',
                     'sin(pk) < 0',
                     'tan(pk) < 0',
@@ -209,11 +208,9 @@ def uncompiledFilters(self):
                     'ln(pk) <= 1',
                     'log(3, pk) <= 1',
                     'log10(pk) < 0.5',
-                    'round(3.14) <= pk',
                     'floor(3.14) <= pk',
                     'ceil(3.14) <= pk',
                     'pk < pi()',
-                    'round(cnt / 66.67) <= 2',
                     'floor(cnt / 66.67) <= 2',
                     'ceil(cnt / 66.67) <= 2',
                     'pk < pi() / 2',