feat(api): add .as_scalar() method for turning expressions into scalar subqueries
#8350
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…lar subqueries (ibis-project#8350) Since there is no safe way to determine whether a table or a column contains a single cell we need to provide a way for the users to inform ibis that it should treat an expression as a scalar subquery. Previously it was the `.to_array()` method, but it only worked for table expressions. Note that when a scalar reduction is passed to certain API methods ibis is able to infer that the value should be turned into a scalar subquery and it implicitly does it. Using this method can be omitted in those cases.
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Since there is no safe way to determine whether a table or a column contains a single cell we need to provide a way for the users to inform ibis that it should treat an expression as a scalar subquery. Previously it was the
.to_array()method, but it only worked for table expressions.Note that when a scalar reduction is passed to certain API methods ibis is able to infer that the value should be turned into a scalar subquery and it implicitly does it. Using this method can be omitted in those cases.