Explanation:To use the $out stage, it must be the last stage in the pipeline. 2. Point out the correct statement :
A. To access variables in expressions, use a string that prefixes the variable name with $$$
B. Expressions can include field paths and system variables, literals, expression objects, and expression operators
C. To specify a field path, use a string that prefixes with a dollar sign % the field name or the dotted field name
D. All of the mentioned
Answer:A
Explanation:To use the $out stage, it must be the last stage in the pipeline. 2. Point out the correct statement :
A. To access variables in expressions, use a string that prefixes the variable name with $$$ B. Expressions can include field paths and system variables, literals, expression objects, and expression operators C. To specify a field path, use a string that prefixes with a dollar sign % the field name or the dotted field name D. All of the mentioned
Explanation:Expressions can be nested. 3. Aggregation expressions use ______ path to access fields in the input documents.