[SPARK-52847] Add ConstraintTests

[dongjoon-hyun]

What changes were proposed in this pull request?

This PR aims to add ConstraintTests.

Why are the changes needed?

To be ready for SPARK-51207 (SPIP: Constraints in DSv2) of Apache Spark 4.1.

• [SPARK-51695][SQL] Introduce Parser Changes for Table Constraints (CHECK, UNIQUE, PK, FK) spark#50496

Does this PR introduce any user-facing change?

No. This is a test suite addition.

How was this patch tested?

Pass the CIs.

Was this patch authored or co-authored using generative AI tooling?

No.

[viirya]

Existing parser can parse these syntaxes?

[dongjoon-hyun]

Thank you for review. Only 4.1.0-preveiw1 support this.

 $ swift test --filter ConstraintTests
...
􀟈  Suite ConstraintTests started.
􀟈  Test primary_key() started.
􁁛  Test primary_key() passed after 0.118 seconds.
􀟈  Test foreign_key() started.
􁁛  Test foreign_key() passed after 0.059 seconds.
􀟈  Test unique() started.
􁁛  Test unique() passed after 0.088 seconds.
􀟈  Test check() started.
􁁛  Test check() passed after 0.087 seconds.
􁁛  Suite ConstraintTests passed after 0.354 seconds.
􁁛  Test run with 4 tests passed after 0.354 seconds.

[dongjoon-hyun]

And, we have CI for that.

• [SPARK-52744] Add MacOS integration test with Apache Spark 4.1.0-preview1 RC1 #210

[viirya]

yea, because you said only syntax test is here because Apache Spark 4.1 is not released yet, it makes me think that prior Apache Spark 4.1 supports only the syntax and Apache Spark 4.1 begins to support the feature fully. 🙂

[dongjoon-hyun]

Thank you, @viirya .

For the record,

spark-sql (default)> SELECT version();
4.0.0 fa33ea000a0bda9e5a3fa1af98e8e85b8cc5e4d4
Time taken: 0.045 seconds, Fetched 1 row(s)

spark-sql (default)> CREATE TABLE primary_key(a INT, PRIMARY KEY(a));

[PARSE_SYNTAX_ERROR] Syntax error at or near '(': missing ')'. SQLSTATE: 42601 (line 1, pos 43)

== SQL ==
CREATE TABLE primary_key(a INT, PRIMARY KEY(a))
-------------------------------------------^^^

[dongjoon-hyun]

cc @peter-toth , FYI.

[dongjoon-hyun]

Merged to main.