You can write multiple queries into a file and then let Impala run your queries directly by passing the query file name. When lots of queries are written in a file, you might require adding comments to specify what each query or a group of queries are, and adding comments to the query file will help you achieve your objective. Impala supports the following two kinds of comments with SQL statements:
-- Sequence(two dashes): All the text after-- Sequenceis considered as a comment and ignored for processing. This comment is used mostly in commenting a complete line in multiline SQL statements./* this is a comment */:The text inside/*and*/will be considered as a comment and will not be processed. This comment is used mostly within the line but it can be stretched into multiple lines as well.
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