lxy-9602 commented on code in PR #416:
URL: https://github.com/apache/paimon-cpp/pull/416#discussion_r4180142306
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src/paimon/common/data/blob_utils.h:
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@@ -88,7 +89,10 @@ class PAIMON_EXPORT BlobUtils {
static bool IsArrayBlobPlaceholder(const arrow::ListArray& array, int64_t
row);
/// Returns whether a MAP<..., BLOB> row is the internal fallback sentinel.
static bool IsMapBlobPlaceholder(const arrow::MapArray& array, int64_t
row);
- /// Rejects MAP<..., BLOB>, which is currently supported by the C++ reader
only.
+ /// Returns whether Paimon C++ supports `key_type` as the key type of
MAP<..., BLOB>:
+ /// BOOLEAN, TINYINT, SMALLINT, INT, BIGINT, DATE, DECIMAL, CHAR/VARCHAR
and BINARY/VARBINARY.
+ static bool IsSupportedMapBlobKeyType(const arrow::DataType& key_type);
+ /// Rejects MAP<..., BLOB> fields whose key type the C++ blob writer does
not support.
static Status ValidateContainerBlobWriteSchema(const
std::shared_ptr<arrow::Schema>& schema);
Review Comment:
Could we move the MAP<BLOB> key-type validation into `SchemaValidation`,
next to the existing BLOB schema rules, and remove
`ValidateContainerBlobWriteSchema` plus its special calls from
`TableSchema::Create` and `FileStoreWrite::Create`? `BlobFormatWriter::Create`
can retain the per-field `IsSupportedMapBlobKeyType` check as a defensive
invariant for direct use.
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