Julian Hyde created CALCITE-5347:
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Summary: Add 'SELECT ... BY', a syntax extension to eliminate
duplicates and sort
Key: CALCITE-5347
URL: https://issues.apache.org/jira/browse/CALCITE-5347
Project: Calcite
Issue Type: Bug
Reporter: Julian Hyde
Many people have observed that SQL query syntax is verbose if you want to
eliminate duplicates and sort. Business intelligence tools often have query
languages that eliminate duplicates and sort by default; we cannot do that in
the SQL {{SELECT}} expression, because that would break compatibility. But we
propose the following variation of {{SELECT}} that is distinguishable from
regular {{SELECT}} (i.e. queries that use it would be invalid in ordinary SQL)
but concise and intuitive.
We propose that
{code:java}
SELECT a BY b
FROM t {code}
is syntactic sugar for
{code:java}
SELECT b, a
FROM t
GROUP BY b
ORDER BY b{code}
In the above, {{a}} and {{b}} may be lists of columns, the columns may include
aliases, and the columns in {{b}} may include sort-key modifiers such as
{{DESC}} and {{{}NULLS LAST{}}}.
This feature was inspired by [Shakti|https://shakti.com/], a SQL-like language
by Arthur Whitney, author of the k language.
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