Remove most unused features of the query builder

Experience has proved programmatically setting joins is not useful, and
getting the types and values of query parts was not being maintained.

The programmatic setting of GROUP BY may be useful in future, however.

lib/Misc/Query.php

@@ -13,10 +13,6 @@ class Query {
     protected $qCTE = []; // Common table expression query components
     protected $tCTE = []; // Common table expression type bindings
     protected $vCTE = []; // Common table expression binding values
-    protected $jCTE = []; // Common Table Expression joins
-    protected $qJoin = []; // JOIN clause components
-    protected $tJoin = []; // JOIN clause type bindings
-    protected $vJoin = []; // JOIN clause binding values
     protected $qWhere = []; // WHERE clause components
     protected $tWhere = []; // WHERE clause type bindings
     protected $vWhere = []; // WHERE clause binding values
@@ -42,24 +38,12 @@ class Query {
         return true;
     }
 
-    public function setCTE(string $tableSpec, string $body, $types = null, $values = null, string $join = ''): bool {
+    public function setCTE(string $tableSpec, string $body, $types = null, $values = null): bool {
         $this->qCTE[] = "$tableSpec as ($body)";
         if (!is_null($types)) {
             $this->tCTE[] = $types;
             $this->vCTE[] = $values;
         }
-        if (strlen($join)) { // the CTE might only participate in subqueries rather than a join on the main query
-            $this->jCTE[] = $join;
-        }
-        return true;
-    }
-
-    public function setJoin(string $join, $types = null, $values = null): bool {
-        $this->qJoin[] = $join;
-        if (!is_null($types)) {
-            $this->tJoin[] = $types;
-            $this->vJoin[] = $values;
-        }
         return true;
     }
 
@@ -88,12 +72,8 @@ class Query {
         return true;
     }
 
-    public function setOrder(string $order, bool $prepend = false): bool {
+    public function setOrder(string $order): bool {
-        if ($prepend) {
+        $this->order[] = $order;
-            array_unshift($this->order, $order);
-        } else {
-            $this->order[] = $order;
-        }
         return true;
     }
 
@@ -103,11 +83,10 @@ class Query {
         return true;
     }
 
-    public function pushCTE(string $tableSpec, string $join = ''): bool {
+    public function pushCTE(string $tableSpec): bool {
         // this function takes the query body and converts it to a common table expression, putting it at the bottom of the existing CTE stack
         // all WHERE, ORDER BY, and LIMIT parts belong to the new CTE and are removed from the main query
         $this->setCTE($tableSpec, $this->buildQueryBody(), [$this->tBody, $this->tWhere, $this->tWhereNot], [$this->vBody, $this->vWhere, $this->vWhereNot]);
-        $this->jCTE = [];
         $this->tBody = [];
         $this->vBody = [];
         $this->qWhere = [];
@@ -116,15 +95,9 @@ class Query {
         $this->qWhereNot = [];
         $this->tWhereNot = [];
         $this->vWhereNot = [];
-        $this->qJoin = [];
-        $this->tJoin = [];
-        $this->vJoin = [];
         $this->order = [];
         $this->group = [];
         $this->setLimit(0, 0);
-        if (strlen($join)) {
-            $this->jCTE[] = $join;
-        }
         return true;
     }
 
@@ -144,49 +117,17 @@ class Query {
     }
 
     public function getTypes(): array {
-        return [$this->tCTE, $this->tBody, $this->tJoin, $this->tWhere, $this->tWhereNot];
+        return [$this->tCTE, $this->tBody, $this->tWhere, $this->tWhereNot];
     }
 
     public function getValues(): array {
-        return [$this->vCTE, $this->vBody, $this->vJoin, $this->vWhere, $this->vWhereNot];
+        return [$this->vCTE, $this->vBody, $this->vWhere, $this->vWhereNot];
-    }
-
-    public function getJoinTypes(): array {
-        return $this->tJoin;
-    }
-
-    public function getJoinValues(): array {
-        return $this->vJoin;
-    }
-
-    public function getWhereTypes(): array {
-        return $this->tWhere;
-    }
-
-    public function getWhereValues(): array {
-        return $this->vWhere;
-    }
-
-    public function getCTETypes(): array {
-        return $this->tCTE;
-    }
-
-    public function getCTEValues(): array {
-        return $this->vCTE;
     }
 
     protected function buildQueryBody(): string {
         $out = "";
         // add the body
         $out .= $this->qBody;
-        if (sizeof($this->qCTE)) {
-            // add any joins against CTEs
-            $out .= " ".implode(" ", $this->jCTE);
-        }
-        // add any JOINs
-        if (sizeof($this->qJoin)) {
-            $out .= " ".implode(" ", $this->qJoin);
-        }
         // add any WHERE terms
         if (sizeof($this->qWhere) || sizeof($this->qWhereNot)) {
             $where = implode(" AND ", $this->qWhere);