S6735: Fix mixed up FQNs for pandas.merge and pandas.join (#1599)

Author: guillaume-dequenne

python-checks/src/main/java/org/sonar/python/checks/PandasAddMergeParametersCheck.java

@@ -95,8 +95,8 @@ int getArgumentPosition(String fullyQualifiedName) {
     }
   }
 
-  private static final String DATAFRAME_JOIN_FQN = "pandas.core.frame.DataFrame.merge";
-  private static final String DATAFRAME_MERGE_FQN = "pandas.core.frame.DataFrame.join";
+  private static final String DATAFRAME_JOIN_FQN = "pandas.core.frame.DataFrame.join";
+  private static final String DATAFRAME_MERGE_FQN = "pandas.core.frame.DataFrame.merge";
   private static final String PANDAS_MERGE_FQN = "pandas.core.reshape.merge.merge";
 
   private static final Set<String> METHODS = Set.of(

python-checks/src/test/java/org/sonar/python/checks/PandasAddMergeParametersCheckTest.java

@@ -47,13 +47,34 @@ void quickfix_test_1() {
       "    age_df = pd.read_csv(\"age_csv.csv\")\n" +
       "    name_df = pd.read_csv(\"name_csv.csv\")\n" +
       "\n" +
-      "    _ = age_df.merge(name_df, how=\"left\", on=None, validate=\"many_to_many\")";
+      "    _ = age_df.merge(name_df, how=\"inner\", on=None, validate=\"many_to_many\")";
     PythonQuickFixVerifier.verify(CHECK, non_compliant, compliant);
     PythonQuickFixVerifier.verifyQuickFixMessages(CHECK, non_compliant, "Add the missing parameters");
   }
 
   @Test
   void quickfix_test_2() {
+    final String non_compliant = "def non_compliant_merge_1():\n" +
+      "    import pandas as pd\n" +
+      "\n" +
+      "    age_df = pd.read_csv(\"age_csv.csv\")\n" +
+      "    name_df = pd.read_csv(\"name_csv.csv\")\n" +
+      "\n" +
+      "    _ = age_df.join(name_df)";
+
+    final String compliant = "def non_compliant_merge_1():\n" +
+      "    import pandas as pd\n" +
+      "\n" +
+      "    age_df = pd.read_csv(\"age_csv.csv\")\n" +
+      "    name_df = pd.read_csv(\"name_csv.csv\")\n" +
+      "\n" +
+      "    _ = age_df.join(name_df, how=\"left\", on=None, validate=\"many_to_many\")";
+    PythonQuickFixVerifier.verify(CHECK, non_compliant, compliant);
+    PythonQuickFixVerifier.verifyQuickFixMessages(CHECK, non_compliant, "Add the missing parameters");
+  }
+
+  @Test
+  void quickfix_test_3() {
     final String non_compliant = "def non_compliant_merge_1():\n" +
       "    import pandas as pd\n" +
       "\n" +
@@ -68,15 +89,15 @@ void quickfix_test_2() {
       "    age_df = pd.read_csv(\"age_csv.csv\")\n" +
       "    name_df = pd.read_csv(\"name_csv.csv\")\n" +
       "\n" +
-      "    _ = age_df.merge(name_df, on=\"user_id\", how=\"left\", validate=\"many_to_many\")";
+      "    _ = age_df.merge(name_df, on=\"user_id\", how=\"inner\", validate=\"many_to_many\")";
 
     PythonQuickFixVerifier.verify(CHECK, non_compliant, compliant);
     PythonQuickFixVerifier.verifyQuickFixMessages(CHECK, non_compliant, "Add the missing parameters");
   }
 
 
   @Test
-  void quickfix_test_3() {
+  void quickfix_test_4() {
     final String non_compliant = "def non_compliant_merge_1():\n" +
       "    import pandas as pd\n" +
       "\n" +