From fd52b85eed3ff9d470787ba2b59674bb7f262f82 Mon Sep 17 00:00:00 2001
From: Kamil Tekiela <tekiela246@gmail.com>
Date: Mon, 19 Dec 2022 18:17:45 +0000
Subject: [PATCH] Microoptimization of fetchResult()

Signed-off-by: Kamil Tekiela <tekiela246@gmail.com>
---
 libraries/classes/DatabaseInterface.php | 46 ++++++++++++-------------
 psalm-baseline.xml                      | 12 +++----
 2 files changed, 28 insertions(+), 30 deletions(-)

diff --git a/libraries/classes/DatabaseInterface.php b/libraries/classes/DatabaseInterface.php
index 09750f10a5a5..adc8d7f56d19 100644
--- a/libraries/classes/DatabaseInterface.php
+++ b/libraries/classes/DatabaseInterface.php
@@ -25,6 +25,7 @@
 use stdClass;
 
 use function __;
+use function array_column;
 use function array_diff;
 use function array_keys;
 use function array_map;
@@ -1293,11 +1294,7 @@ private function fetchValueOrValueByIndex($row, $value)
      */
     private function fetchByMode(ResultInterface $result, string $mode): array
     {
-        if ($mode === self::FETCH_NUM) {
-            return $result->fetchRow();
-        }
-
-        return $result->fetchAssoc();
+        return $mode === self::FETCH_NUM ? $result->fetchRow() : $result->fetchAssoc();
     }
 
     /**
@@ -1364,23 +1361,20 @@ public function fetchResult(
 
         // return empty array if result is empty or false
         if ($result === false) {
-            return $resultRows;
+            return [];
         }
 
-        $fetchFunction = self::FETCH_ASSOC;
-
         if ($key === null) {
             // no nested array if only one field is in result
-            if ($result->numFields() === 1) {
-                $value = 0;
-                $fetchFunction = self::FETCH_NUM;
+            if ($value === 0 || $result->numFields() === 1) {
+                return $result->fetchAllColumn();
             }
 
-            while ($row = $this->fetchByMode($result, $fetchFunction)) {
-                $resultRows[] = $this->fetchValueOrValueByIndex($row, $value);
-            }
-        } elseif (is_array($key)) {
-            while ($row = $this->fetchByMode($result, $fetchFunction)) {
+            return $value === null ? $result->fetchAllAssoc() : array_column($result->fetchAllAssoc(), $value);
+        }
+
+        if (is_array($key)) {
+            while ($row = $result->fetchAssoc()) {
                 $resultTarget =& $resultRows;
                 foreach ($key as $keyIndex) {
                     if ($keyIndex === null) {
@@ -1397,15 +1391,19 @@ public function fetchResult(
 
                 $resultTarget = $this->fetchValueOrValueByIndex($row, $value);
             }
-        } else {
-            // if $key is an integer use non associative mysql fetch function
-            if (is_int($key)) {
-                $fetchFunction = self::FETCH_NUM;
-            }
 
-            while ($row = $this->fetchByMode($result, $fetchFunction)) {
-                $resultRows[$row[$key]] = $this->fetchValueOrValueByIndex($row, $value);
-            }
+            return $resultRows;
+        }
+
+        if ($key === 0 && $value === 1) {
+            return $result->fetchAllKeyPair();
+        }
+
+        // if $key is an integer use non associative mysql fetch function
+        $fetchFunction = is_int($key) ? self::FETCH_NUM : self::FETCH_ASSOC;
+
+        while ($row = $this->fetchByMode($result, $fetchFunction)) {
+            $resultRows[$row[$key]] = $this->fetchValueOrValueByIndex($row, $value);
         }
 
         return $resultRows;
diff --git a/psalm-baseline.xml b/psalm-baseline.xml
index c8938c0a3db6..aacc1a0b8597 100644
--- a/psalm-baseline.xml
+++ b/psalm-baseline.xml
@@ -5685,22 +5685,18 @@
       <code>$tableData['Engine']</code>
       <code>$tableData['Index_length']</code>
     </MixedArrayAccess>
-    <MixedArrayOffset occurrences="7">
+    <MixedArrayOffset occurrences="4">
       <code>$resultRows[$row[$key]]</code>
-      <code>$resultTarget[$row[$keyIndex]]</code>
-      <code>$resultTarget[$row[$keyIndex]]</code>
-      <code>$resultTarget[$row[$keyIndex]]</code>
       <code>$row[$keyIndex]</code>
       <code>$row[$keyIndex]</code>
       <code>$row[$keyIndex]</code>
     </MixedArrayOffset>
-    <MixedAssignment occurrences="14">
+    <MixedAssignment occurrences="13">
       <code>$aLength</code>
       <code>$bLength</code>
       <code>$keyIndex</code>
       <code>$map['real_column']</code>
       <code>$resultRows[$row[$key]]</code>
-      <code>$resultRows[]</code>
       <code>$resultTarget</code>
       <code>$table</code>
       <code>$tableData</code>
@@ -5738,6 +5734,10 @@
     <PossiblyInvalidArrayOffset occurrences="1">
       <code>$row[$value]</code>
     </PossiblyInvalidArrayOffset>
+    <PossiblyNullArrayOffset occurrences="2">
+      <code>$resultTarget</code>
+      <code>$resultTarget</code>
+    </PossiblyNullArrayOffset>
     <PossiblyNullOperand occurrences="7">
       <code>$row['Data_free']</code>
       <code>$row['Data_length']</code>