[BUG] Existing field cannot be overriden with parse command

[kt-eliatra]

What is the bug?
According to https://github.com/opensearch-project/sql/blob/main/docs/user/ppl/cmd/parse.rst#example-2-override-an-existing-field, the parse command can be used to override an existing field. It doesn't work in spark ppl.

How can one reproduce the bug?
Steps to reproduce the behavior:

1. Create table and add data

CREATE TABLE test (
   name STRING, age INT, email STRING, street_address STRING
);

INSERT INTO test VALUES 
("Alice", 30, "alice@example.com", "123 Main St, Seattle"),
("Bob", 55, "bob@test.org", "456 Elm St, Portland"),
("Charlie", 65, "charlie@domain.net", "789 Pine St, San Francisco"),
("David", 19, "david@anotherdomain.com", "101 Maple St, New York");

2. Run command like

source=test | parse email '.+@(?<email>.+)' | fields email;

3. It returns

[AMBIGUOUS_REFERENCE] Reference `email` is ambiguous, could be: [`email`, `spark_catalog`.`default`.`test`.`email`].

What is the expected behavior?
Values from the existing email column are overridden by values computed by the parse command.

What is your host/environment?

• OS: Linux Mint

Do you have any screenshots?
If applicable, add screenshots to help explain your problem.

Do you have any additional context?
Add any other context about the problem.

[salyh]

Is it even possible to replace a existing column with a new computed column with same name in spark? Not sure about this.