Explanation:
The correct answer is option A because it correctly uses the from_unixtime function to convert the UNIX timestamp in the openDate column to a formatted string representation as specified by the SimpleDateFormat pattern. The function from_unixtime takes two arguments: the column containing the UNIX timestamp and the format string. Option A correctly specifies both, despite a typographical error in the function name (missing underscore in the question text). Options B, C, D, and E either use incorrect functions, add unnecessary arguments, or use non-existent methods, making them incorrect.
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Which of the following code blocks correctly converts the openDate column (stored as integer UNIX timestamps representing seconds since 1970-01-01) into a string column openDateString formatted using Java's SimpleDateFormat (e.g., "Sunday, Dec 4, 2008 1:05 pm")?
Given the following sample data from storesDF:
storeId openDate
0 1100746394
1 1474410343
2 1116610009
3 1180035265
4 1408024997
storeId openDate
0 1100746394
1 1474410343
2 1116610009
3 1180035265
4 1408024997
A
storesDF.withColumn("openDatestring", from_unixtime(col("openDate“), “EEEE, MMM d, yyyy h:mm a"))
B
storesDF.withColumn("openDateString", from_unixtime(col("openDate“), "EEEE, MMM d, yyyy h:mm a", TimestampType()))
C
storesDF.withColumn("openDateString", date(col("openDate"), "EEEE, MMM d, yyyy h:mm a"))
D
storesDF.newColumn(col("openDateString"), from_unixtime("openDate", "EEEE, MMM d, yyyy h:mm a"))
E
storesDF.withColumn("openDateString", date(col("openDate“), "EEEE, MMM d, yyyy h:mm a", TimestampType))