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Practice query plans

A dataframe text_df is available. This dataframe is registered as a table called table1.

Diese Übung ist Teil des Kurses

Introduction to Spark SQL in Python

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Anleitung zur Übung

  • Run explain on text_df.
  • Run explain on a SQL query that does a "SELECT COUNT(*) as count" on table1.
  • Run explain on a SQL query that counts the number of unique words in table1.

Interaktive Übung

Vervollständige den Beispielcode, um diese Übung erfolgreich abzuschließen.

# Run explain on text_df
text_df.____()

# Run explain on "SELECT COUNT(*) AS count FROM table1" 
spark.sql("SELECT COUNT(*) AS count FROM table1").____()

# Run explain on "SELECT COUNT(DISTINCT word) AS words FROM table1"
spark.sql("____").____()
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