thswlsqls opened a new issue, #17092:
URL: https://github.com/apache/iceberg/issues/17092
**Apache Iceberg version**
main @ 3038fde68
**Query engine**
None — engine-agnostic, reproducible via the Java Generic Read API
(`Parquet.read(...).filter(...)`).
**Please describe the bug**
`ParquetFilters.getParquetPrimitive()`
(`parquet/src/main/java/org/apache/iceberg/parquet/ParquetFilters.java` line
219) only handles `Number`, `CharSequence`, and `ByteBuffer` literal values, so
any `EQ`/`NOT_EQ` predicate on a `boolean` column falls through to the
exception on line 233. `Literals.BooleanLiteral`
(`api/.../expressions/Literals.java`) always returns a `java.lang.Boolean`, so
this path is unavoidable for any boolean predicate. The exception is thrown
while building the Parquet read builder (`Parquet.java` line 1635), before any
rows are read — the read fails outright instead of falling back to a full scan.
**Steps to reproduce**
1. Write a Parquet file for a schema containing a `required(N, "b",
Types.BooleanType.get())` column.
2. Read it back with
`Parquet.read(input).project(schema).filter(Expressions.equal("b",
true)).build()`.
3. Observe `java.lang.UnsupportedOperationException: Type not supported yet:
java.lang.Boolean` at `ParquetFilters.getParquetPrimitive`, called from
`ConvertFilterToParquet.predicate()`'s `case BOOLEAN` branch.
Expected: the reader returns only matching rows. Actual: the read throws
before returning any rows.
**Additional context**
Same failure occurs for `Expressions.notEqual("b", false)`. `Number` values
in the same method are returned via a direct cast; `Boolean` needs the
identical treatment since `FilterApi.eq(BooleanColumn, Boolean)` expects a
`Boolean` as-is.
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