huaxingao commented on code in PR #2078:
URL: https://github.com/apache/datafusion-comet/pull/2078#discussion_r2261441438
##########
common/src/main/java/org/apache/comet/parquet/Utils.java:
##########
@@ -453,4 +457,60 @@ private static LogicalTypeAnnotation
reconstructLogicalType(
throw new IllegalArgumentException("Unknown logical type: " +
logicalTypeName);
}
}
+
+ public static ParquetColumnSpec
descriptorToParquetColumnSpec(ColumnDescriptor descriptor) {
+
+ String[] path = descriptor.getPath();
+ PrimitiveType primitiveType = descriptor.getPrimitiveType();
+ String physicalType = primitiveType.getPrimitiveTypeName().name();
+
+ int typeLength =
+ primitiveType.getPrimitiveTypeName() ==
PrimitiveType.PrimitiveTypeName.FIXED_LEN_BYTE_ARRAY
+ ? primitiveType.getTypeLength()
+ : 0;
+
+ boolean isRepeated = primitiveType.getRepetition() ==
Type.Repetition.REPEATED;
+
+ String logicalTypeName = null;
+ Map<String, String> logicalTypeParams = new HashMap<>();
+ LogicalTypeAnnotation logicalType =
primitiveType.getLogicalTypeAnnotation();
+
+ if (logicalType != null) {
+ logicalTypeName = logicalType.getClass().getSimpleName();
+
+ // Handle specific logical types
+ if (logicalType instanceof
LogicalTypeAnnotation.DecimalLogicalTypeAnnotation) {
+ LogicalTypeAnnotation.DecimalLogicalTypeAnnotation decimal =
+ (LogicalTypeAnnotation.DecimalLogicalTypeAnnotation) logicalType;
+ logicalTypeParams.put("precision",
String.valueOf(decimal.getPrecision()));
+ logicalTypeParams.put("scale", String.valueOf(decimal.getScale()));
+ } else if (logicalType instanceof
LogicalTypeAnnotation.TimestampLogicalTypeAnnotation) {
+ LogicalTypeAnnotation.TimestampLogicalTypeAnnotation timestamp =
+ (LogicalTypeAnnotation.TimestampLogicalTypeAnnotation) logicalType;
+ logicalTypeParams.put("isAdjustedToUTC",
String.valueOf(timestamp.isAdjustedToUTC()));
+ logicalTypeParams.put("unit", timestamp.getUnit().name());
+ } else if (logicalType instanceof
LogicalTypeAnnotation.TimeLogicalTypeAnnotation) {
+ LogicalTypeAnnotation.TimeLogicalTypeAnnotation time =
+ (LogicalTypeAnnotation.TimeLogicalTypeAnnotation) logicalType;
+ logicalTypeParams.put("isAdjustedToUTC",
String.valueOf(time.isAdjustedToUTC()));
+ logicalTypeParams.put("unit", time.getUnit().name());
+ } else if (logicalType instanceof
LogicalTypeAnnotation.IntLogicalTypeAnnotation) {
+ LogicalTypeAnnotation.IntLogicalTypeAnnotation intType =
+ (LogicalTypeAnnotation.IntLogicalTypeAnnotation) logicalType;
+ logicalTypeParams.put("isSigned", String.valueOf(intType.isSigned()));
+ logicalTypeParams.put("bitWidth",
String.valueOf(intType.getBitWidth()));
+ }
+ }
+
+ return new ParquetColumnSpec(
+ 1, // ToDo: pass in the correct id
Review Comment:
`ColumnDescriptor` doesn't expose fieldId, but we need a placeholder here. I
guess put -1 for unknown id?
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