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docs: fix list

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(cherry picked from commit 618a3f91d8)
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james
2020-01-02 15:46:49 +00:00
parent cdcca630f3
commit 2407eb103a
1 changed files with 9 additions and 3 deletions
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docs/language/ql-spec/language.rst
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@@ -1075,10 +1075,16 @@ Apart from the presence or absence of the rank variable, all other reduced forms
- If the formula is omitted, then it is taken to be ``any()``.
- If there are no aggregation expressions, then either:
+ The aggregation id is ``count`` or ``strictcount`` and the expression is taken to be ``1``.
+ There must be precisely one variable declaration, and the aggregation expression is taken to be a reference to that variable.
- The aggregation id is ``count`` or ``strictcount`` and the expression is taken to be ``1``.
- There must be precisely one variable declaration, and the aggregation expression is taken to be a reference to that variable.
- If the aggregation id is ``concat`` or ``strictconcat`` and it has a single expression then the second expression is taken to be ``""``.
- If the ``monotonicAggregates`` language pragma is not enabled, or the original formula and variable declarations are both omitted, then the aggregate is transformed as follows: - For each aggregation expression ``expr_i``, a fresh variable ``v_i`` is declared with the same type as the expression in addition to the original variable declarations. - The new range is the conjunction of the original range and a term ``v_i = expr_i`` for each aggregation expression ``expr_i``. - Each original aggregation expression ``expr_i`` is replaced by a new aggregation expression ``v_i``.
- If the ``monotonicAggregates`` language pragma is not enabled, or the original formula and variable declarations are both omitted, then the aggregate is transformed as follows:
- For each aggregation expression ``expr_i``, a fresh variable ``v_i`` is declared with the same type as the expression in addition to the original variable declarations.
- The new range is the conjunction of the original range and a term ``v_i = expr_i`` for each aggregation expression ``expr_i``.
- Each original aggregation expression ``expr_i`` is replaced by a new aggregation expression ``v_i``.
The variables in the variable declarations list must not occur in the typing environment.