Revert "[SPARK-9154] [SQL] codegen StringFormat"

[marmbrus]

This reverts commit 7f072c3.

Revert #7546

[tarekbecker]

Can I reopen the last PR to fix the issue or do I have to create a new one, because the old one got merged?

[marmbrus]

I think you might be able to reopen.

[SparkQA]

Test build #37969 has finished for PR 7570 at commit ed2c32a.

• This patch passes all tests.
• This patch merges cleanly.
• This patch adds the following public classes (experimental):
  • case class Data(topic: Vector, index: Int)
  • case class Data(globalTopicTotals: Vector)
  • case class VertexData(id: Long, topicWeights: Vector)
  • case class EdgeData(srcId: Long, dstId: Long, tokenCounts: Double)
  • case class NaNvl(left: Expression, right: Expression)