Did you already try :
STR(ANY_META('trip')) != null ??
I think null is use by BQL to represent Python's None.
As a sidenote, != null is not "sql"-like since in sql, IS NULL/ IS NOT NULL
expressions are used instead. These are special since the = operator is
strict i.e returns NULL if any of its operand is NULL. That means in a
WHERE clause, the NULL results work like 'false'.
On Saturday, September 29, 2018 at 12:38:41 AM UTC-5, Stefano Zacchiroli
wrote:
>
> New issue 335: BQL: None should be considered False in boolean context
>
> https://bitbucket.org/blais/beancount/issues/335/bql-none-should-be-considered-false-in
>
>
> Stefano Zacchiroli:
>
> The following query:
> ```
> #!bql
>
> SELECT ANY_META('trip') AS trip, SUM(position) AS amount
> WHERE account ~ '^Assets:Reimbursable'
> AND ANY_META('trip')
> GROUP BY trip
> ```
> when 'trip' might be missing from some transaction fails as follows:
> ```
> #!python
>
> File
> "/home/zack/.local/lib/python3.6/site-packages/beancount/query/query_compile.py",
>
> line 121, in __call__
> return self.operator(self.left(context), self.right(context))
> TypeError: unsupported operand type(s) for &: 'bool' and 'str'
> ```
> the string in question is probably "None", i.e., the string representation
> of Python None values.
>
> It would be nice if missing metadata could be treated as False in boolean
> context by BQL.
>
>
>
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