"Impala Conditional Functions" documentation errata

Consider the documentation page Impala Conditional Functions.

Multiple functions have ambiguous descriptions. For example:

isfalse(boolean)

Purpose: Tests if a Boolean expression is false or not. Returns true if so.

The above is confusing, it essentially means: "Returns true if a Boolean expression is false or not." This obviously means the function always returns false, which is not accurate.

Reword to say: "Returns true if the expression is false. Returns false if the expression is true or NULL."

Other ambiguous descriptions:

istrue(boolean)

Purpose: Tests if a Boolean expression is true or not. Returns true if so.

Better: "Returns true if an expression is true. Returns false if the expression is false or NULL."

Others:

nonnullvalue(expression)

Purpose: Tests if an expression (of any type) is NULL or not. Returns false if so.

Better: "Returns true if the expression is non-null, tase if the expression is null. Same as expression IS NOT NULL."

nullvalue(expression)

Purpose: Tests if an expression (of any type) is NULL or not. Returns true if so.

Better: "Returns true if the expression is NULL, false otherwise. Same as expression IS NULL"