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LATERAL VIEW EXPLODE in Spark
https://jdhao.github.io/2023/09/26/spark_lateral_view_explode/
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For array type column, explode() will convert it to n rows, where n is the number of elements in the array. For map/dictionary type column, explode() will convert it to nx2 shape, i.e., n rows, 2 columns (for key and value).
