logstash 7.4.0 empty http body about logstash-output-clickhouse HOT 2 OPEN

  def mutate( src )
    res = {}
    @mutations.each_pair do |dstkey, source|
      case source
        when String then
          scrkey = source
          next unless src.key?(scrkey)

          res[dstkey] = src[scrkey]
        when Array then
          scrkey = source[0]
          next unless src.key?(scrkey)
          pattern = source[1]
          replace = source[2]
          res[dstkey] = src[scrkey].sub( Regexp.new(pattern), replace )
      end
    end
    res
  end

--- clickhouse.rb.old   2019-11-29 14:14:08.206871867 +0300
+++ clickhouse.rb       2019-11-29 14:12:30.039874141 +0300
@@ -127,6 +127,7 @@
   end
 
   def mutate( src )
+    return src if @mutations.empty?
     res = {}
     @mutations.each_pair do |dstkey, source|
       case source