perf: remove one call to push in copy-from transform loop

README.md

@@ -87,6 +87,8 @@ Since this isn't a module with tons of installs and dependent modules I hope we
 
 ### version 2.x - published YYYY-MM-DD
 
+ * Small refactor in copy-from passing from 3 push to 2 push in every chunk transform loop
+
 ### version 2.1.0 - published 2019-03-19
 
  * Change README to stop using the pg pool singleton (removed after pg 7.0)

index.js

@@ -30,12 +30,10 @@ CopyStreamQuery.prototype.submit = function(connection) {
 }
 
 
-var copyDataBuffer = Buffer.from([code.CopyData])
 CopyStreamQuery.prototype._transform = function(chunk, enc, cb) {
   var Int32Len = 4;
-  this.push(copyDataBuffer)
+  var lenBuffer = Buffer.from([code.CopyData, 0, 0, 0, 0])
-  var lenBuffer = Buffer.alloc(Int32Len)
+  lenBuffer.writeUInt32BE(chunk.length + Int32Len, 1)
-  lenBuffer.writeUInt32BE(chunk.length + Int32Len, 0)
   this.push(lenBuffer)
   this.push(chunk)
   cb()