[release/3.1] Cosmos: Avoid using "value" as an alias

[AndriySvyryd]

Fixes #20557

Description

EF generates aliases in the SQL query based on the projection properties. However "value" is a keyword in CosmosDB, so projections with a "Value" property result in invalid SQL.

Customer Impact

This is especially impactful when used with OData, as it generates this type of queries frequently and there's no workaround for the user.

How found

Reported by customer.

Test coverage

Added a test using this pattern.

Regression?

No.

Risk

Low. Fix only affects the alias used in the SQL.

[smitpatel]

We should discuss with cosmos team to find a better solution.
Other keywords which fails in same way

• Distinct
• From
• AS
• Where
• order by
• group by
• offset
• limit

[smitpatel]

May be we should generate SQL this way

SELECT VALUE { "Value" : c["OrderID"] }
FROM root c
WHERE (c["Discriminator"] = "Order")

Then we can probably avoid all clashes?

[AndriySvyryd]

@smitpatel Sure, but that change would be risky for patch

[AndriySvyryd]

Filed #20613