Remove the useless Project in plan

[Shylock-Hg]

Introduction

Subjob of #4122

Contents

e.g.

      explain format = 'dot'
      MATCH (message:Message)
      WHERE message.Message.creationDate < "20110721220000000"
      WITH count(message) AS totalMessageCountInt
      WITH toFloat(totalMessageCountInt) AS totalMessageCount
      MATCH (message:Message)
      WHERE message.Message.creationDate < "20110721220000000"
        AND message.Message.content IS NOT NULL
      WITH
        totalMessageCount,
        message,
        toInteger(message.Message.creationDate)/10000000000000 AS year
      WITH
        totalMessageCount,
        year,
        "Comment" IN tags(message) AS isComment,
        CASE
          WHEN message.Message.length <  40 THEN 0
          WHEN message.Message.length <  80 THEN 1
          WHEN message.Message.length < 160 THEN 2
          ELSE                           3
        END AS lengthCategory,
        count(message) AS messageCount,
        floor(avg(message.Message.length)) AS averageMessageLength,
        sum(message.Message.length) AS sumMessageLength
      RETURN
        year,
        isComment,
        lengthCategory,
        messageCount,
        averageMessageLength,
        sumMessageLength,
        messageCount / totalMessageCount AS percentageOfMessages
      ORDER BY
        year DESC,
        isComment ASC,
        lengthCategory ASC

As above, Project_7 and Project_11 could be eliminated.

Related work