mzzz-zzm opened a new pull request, #1121:
URL: https://github.com/apache/iceberg-go/pull/1121

   DecimalLiteral.Type() hardcodes precision 9 because DecimalLiteral does not 
carry the originating column's declared precision. The only confirmed consumer 
that mis-uses this is toDecimalLiteral in table/substrait/substrait.go, which 
embedded the wrong precision in emitted Substrait literals for any column with 
precision != 9.
   
   Per the Option B consensus on #1028:
   
   1. toDecimalLiteral now reads precision from the bound field's 
iceberg.DecimalType rather than v.Type().
   2. Replaces the latent panic v.Type().(*iceberg.DecimalType) with the 
correct value-type assertion v.Type().(iceberg.DecimalType); DecimalTypeOf 
returns by value.
   3. Documents the precision caveat on DecimalLiteral.Type() so future callers 
consult the bound field type for real precision.
   4. Adds whitebox regression tests for the bound-field path and the defensive 
fallback path.
   
   Fixes #1028


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