GH-1300: Use Locale.ROOT when building C Data Interface format strings - #1301
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…strings Format.asString built the FixedSizeList, FixedSizeBinary and Decimal format strings with String.format and no explicit Locale, so JVMs whose default locale uses digits outside ASCII exported strings such as "+w:٨" that other Arrow implementations cannot parse. Closes apache#1300.
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September 19, 2026 17:12
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Format.asStringbuilt theFixedSizeList(+w:%d),FixedSizeBinary(w:%d) andDecimal(d:%d,%d[,%d]) format strings withString.formatand no explicitLocale.java.util.Formatterlocalises the digits of%dwith the default locale, so a JVM running underar-EG,bn-BD,mr-INand similar locales exported+w:٨instead of+w:8, which arrow-rs and other implementations reject.This passes
Locale.ROOTto the four calls and addsFormatTest.testAsStringIgnoresDefaultLocale, which sets the default locale toar-EGfor the duration of the test and asserts the ASCII output.Closes #1300.