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docs(querying): document the NULL predicate in a list comprehension #1754

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vpavicic merged 1 commit into from
Sep 8, 2026
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docs(querying): document the NULL predicate in a list comprehension #1754

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13 changes: 13 additions & 0 deletions pages/querying/expressions.mdx
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Expand Up @@ -312,6 +312,19 @@ The general syntax for list comprehension in Cypher is:
- **`predicate`** (optional): A condition that filters elements; only elements satisfying this condition are processed.
- **`expression`**: An expression applied to each filtered element; the results form the new list.

When the predicate is `null` for an element, that element is skipped and the
other elements are still returned, the same as when the predicate is `false`.
A list that contains `null`, or a property that an element does not have, does
not turn the whole result into `null`:

```cypher
RETURN [x IN [1, null, 3] WHERE x > 0 | x] AS positives
```

**Result:** `[1, 3]`

If the list itself is `null`, the result is `null`.

**Examples:**

1. **Transforming a list:**
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