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A[n]

A is an Array and n is an int

returns the nth element in the array A. The first element has index 0 e.g. if A is an array comprising of ['foo', 'bar'] then A[0] returns 'foo' and A[1] returns 'bar'

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M[key]

M is a Map<K, V> and key has type K

returns the value corresponding to the key in the map e.g. if M is a map comprising of {'f' -> 'foo', 'b' -> 'bar', 'all' -> 'foobar'} then M['all'] returns 'foobar'

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S.x

S is a struct

returns the x field of S e.g for struct foobar {int foo, int bar} foobar.foo returns the integer stored in the foo field of the struct.

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BIGINT

count(*), count(expr), count(DISTINCT expr[, expr_.])

count(*) - Returns the total number of retrieved rows, including rows containing NULL values; count(expr) - Returns the number of rows for which the supplied expression is non-NULL; count(DISTINCT expr[, expr]) - Returns the number of rows for which the supplied expression(s) are unique and non-NULL.

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DOUBLE

sum(col), sum(DISTINCT col)

returns the sum of the elements in the group or the sum of the distinct values of the column in the group

DOUBLE

avg(col), avg(DISTINCT col)

returns the average of the elements in the group or the average of the distinct values of the column in the group

DOUBLE

min(col)

returns the minimum value of the column in the group

DOUBLE

max(col)

returns the maximum value of the column in the group