alamb commented on code in PR #3397:
URL: https://github.com/apache/parquet-java/pull/3397#discussion_r4103130277
##########
parquet-column/src/main/java/org/apache/parquet/column/Encoding.java:
##########
@@ -147,6 +149,26 @@ public ValuesReader getValuesReader(ColumnDescriptor
descriptor, ValuesType valu
}
},
+ /**
+ * ALP (Adaptive Lossless floating-Point) encoding for FLOAT and DOUBLE
types.
+ * Works by converting floating-point values to integers using decimal
scaling,
+ * then applying Frame of Reference (FOR) encoding and bit-packing.
Review Comment:
May I suggest
https://parquet.apache.org/blog/2026/09/22/alp-adaptive-lossless-floating-point-encoding-in-apache-parquet/
or https://parquet.apache.org/docs/file-format/data-pages/alpencoding/
##########
parquet-column/src/main/java/org/apache/parquet/column/Encoding.java:
##########
@@ -147,6 +149,26 @@ public ValuesReader getValuesReader(ColumnDescriptor
descriptor, ValuesType valu
}
},
+ /**
+ * ALP (Adaptive Lossless floating-Point) encoding for FLOAT and DOUBLE
types.
+ * Works by converting floating-point values to integers using decimal
scaling,
+ * then applying Frame of Reference (FOR) encoding and bit-packing.
Review Comment:
May I suggest links to
https://parquet.apache.org/blog/2026/09/22/alp-adaptive-lossless-floating-point-encoding-in-apache-parquet/
or https://parquet.apache.org/docs/file-format/data-pages/alpencoding/
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