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Add info about invalid VIEWs

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Dmitry Novik 2024-06-06 19:17:34 +02:00 committed by GitHub
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docs/en/operations/analyzer.md
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@ -56,6 +56,23 @@ WHERE number > 5
GROUP BY n
```
### CREATE VIEW with invalid query
The new infrastructure always performs type-checking.
Previously, it was possible to create a `VIEW` with an invalid `SELECT` query, and it'd fail during the first SELECT or insert (in the case of `MATERIALIZED VIEW`).
Now, it's not possible to create such `VIEW`s anymore.
**Example:**
```sql
CREATE TABLE source (data String) ENGINE=MergeTree ORDER BY tuple();
CREATE VIEW some_view
AS SELECT JSONExtract(data, 'test', 'DateTime64(3)')
FROM source;
```
### Known incompatibilities of JOIN clause
#### Join using column from projection