[SPARK-13755] Escape quotes in SQL plan visualization node labels
When generating Graphviz DOT files in the SQL query visualization we need to escape double-quotes inside node labels. This is a followup to #11309, which fixed a similar graph in Spark Core's DAG visualization. Author: Josh Rosen <joshrosen@databricks.com> Closes #11587 from JoshRosen/graphviz-escaping.
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