use GROUP_CONCAT_DISTINCT

Author: splitbrain

_test/AccessTableDataSQLTest.php

@@ -51,7 +51,7 @@ public static function buildGetDataSQL_testdata()
                 "SELECT DATA.pid AS PID,
                         DATA.col1 AS out1,
                         DATA.col2 AS out2,
-                        GROUP_CONCAT(M3.value,'" . Search::CONCAT_SEPARATOR . "') AS out3
+                        GROUP_CONCAT_DISTINCT(M3.value,'" . Search::CONCAT_SEPARATOR . "') AS out3
                    FROM data_testtable AS DATA
                    LEFT OUTER JOIN multi_testtable AS M3
                      ON DATA.pid = M3.pid
@@ -70,8 +70,8 @@ public static function buildGetDataSQL_testdata()
                     'multis' => ['dokuwiki\\plugin\\struct\\types\\Text', 'dokuwiki\\plugin\\struct\\types\\Text']
                 ],
                 "SELECT DATA.pid AS PID,
-                        GROUP_CONCAT(M1.value,'" . Search::CONCAT_SEPARATOR . "') AS out1,
-                        GROUP_CONCAT(M2.value,'" . Search::CONCAT_SEPARATOR . "') AS out2
+                        GROUP_CONCAT_DISTINCT(M1.value,'" . Search::CONCAT_SEPARATOR . "') AS out1,
+                        GROUP_CONCAT_DISTINCT(M2.value,'" . Search::CONCAT_SEPARATOR . "') AS out2
                    FROM data_testtable AS DATA
                    LEFT OUTER JOIN multi_testtable AS M2
                      ON DATA.pid = M2.pid

meta/AccessTable.php

@@ -518,7 +518,7 @@ protected function buildGetDataSQL($idColumn = 'pid')
                 );
                 $col->getType()->select($QB, $tn, 'value', $outname);
                 $sel = $QB->getSelectStatement($outname);
-                $QB->addSelectStatement("GROUP_CONCAT($sel, '$sep')", $outname);
+                $QB->addSelectStatement("GROUP_CONCAT_DISTINCT($sel, '$sep')", $outname);
             } else {
                 $col->getType()->select($QB, 'DATA', $colname, $outname);
                 $QB->addGroupByStatement($outname);

meta/Search.php

@@ -501,7 +501,7 @@ public function getSQL()
 
                 $col->getType()->select($QB, $MN, 'value', $CN);
                 $sel = $QB->getSelectStatement($CN);
-                $QB->addSelectStatement("GROUP_CONCAT($sel, '$sep')", $CN);
+                $QB->addSelectStatement("GROUP_CONCAT_DISTINCT($sel, '$sep')", $CN);
             } else {
                 $col->getType()->select($QB, 'data_' . $col->getTable(), $col->getColName(), $CN);
                 $QB->addGroupByStatement($CN);