Bugfix/2026 05 issues 717

[takapi327]

Implementation Details

Root Cause

DataTypeParser.doubleType constructed DataType.FLOAT for both DOUBLE and REAL keywords, and DataType.DOUBLE did not exist. This caused 64-bit database columns to silently map to Scala's 32-bit Float type.

Changes

• DataType.scala: Added DataType.DOUBLE case class with sqlType = Types.DOUBLE and scalaType = ScalaType.Double
• DataTypeParser.scala: Updated doubleType parser to return DataType.DOUBLE instead of DataType.FLOAT
• DataTypeCodeBuilder.scala: Added a DataType.DOUBLE match arm to generate the correct code string

Test

Added a regression test to DataTypeParserTest.scala that asserts parsing DOUBLE and REAL produces DataType.DOUBLE instances, not DataType.FLOAT.

Fixes

Fixes #717

Pull Request Checklist

• Wrote unit and integration tests
• Linked to Github issue with discussion and accepted design OR link to spec that describes this work.
• Code formatting by scalafmt (sbt scalafmtAll command execution)
• Add copyright headers to new files

References