[CALCITE-6322] Casts to DECIMAL types are ignored

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.36.0
• Fix Version/s: 1.38.0
• Component/s: core
• Labels: pull-request-available
• Assignee: Unassigned
• Reporter: Mihai Budiu
• Created: 12/Mar/24 01:20
• Updated: 17/Oct/24 22:41
• Resolved: 17/Oct/24 22:41

Description

The following SqlOperatorTest fails:

f.checkScalar("CAST(1.123 AS DECIMAL(4, 0))", "1.0", "DECIMAL(4, 0) NOT NULL");

The result computed by Calcite is 1.123, ignoring the scale of the DECIMAL result.
Spark, Postgres, MySQL all return 1.0.

I have marked this as a major bug.

Issue Links

• causes: IGNITE-22519 Sql. Numerics. Conversion produces incorrect results
• contains: CALCITE-5860 Decimal type conversion missing scale
• contains: CALCITE-6073 Documentation does not specify CAST behavior
• is duplicated by: CALCITE-6078 Explicit cast to DECIMAL types do not check for overflow
• relates to: CALCITE-6328 The BigQuery functions SAFE_* do not match the BigQuery specification
• relates to: CALCITE-6324 Type inferred for result of STDDEV, VAR_SAMP, etc. is incorrect
• links to: GitHub Pull Request #3733