File size: 2,726 Bytes
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"schema_version": "1.0",
"scenario_id": "dictionary_reencoded",
"title": "Dictionary contents change without any value change",
"category": "representation",
"description": "Both versions store the same dictionary<int8, string> column with the same decoded values. The stored dictionaries differ: v0 has a different order and an entry that no row uses; v1 has exactly the used values. Schema, rows and values are unchanged, so both versions have the same logical fingerprint.",
"notes": [
"Tools that compare dictionary indices, category lists or category codes observe a change here. The decoded values do not change.",
"The unused dictionary entry survives a PyArrow round trip; other readers may rebuild the dictionary on read and drop it."
],
"tags": [
"dictionary",
"categorical",
"encoding",
"no-schema-change",
"no-value-change"
],
"row_identity": [
"id"
],
"versions": [
{
"id": "v0",
"file": "v0.parquet",
"row_count": 6,
"fingerprint": "sha256:6dfdbf0a9de0eac2a01b3d7a88cb06abe18009dfa4d033259c14f39d7bf16d9b",
"schema": [
{
"name": "id",
"type": "int64",
"nullable": false
},
{
"name": "status",
"type": "dictionary<values=string, indices=int8, ordered=0>",
"nullable": true
}
],
"writer": {
"use_dictionary": true
},
"dictionaries": [
{
"path": "status",
"values": [
"pending",
"active",
"inactive",
"archived"
]
}
]
},
{
"id": "v1",
"file": "v1.parquet",
"row_count": 6,
"fingerprint": "sha256:6dfdbf0a9de0eac2a01b3d7a88cb06abe18009dfa4d033259c14f39d7bf16d9b",
"schema": [
{
"name": "id",
"type": "int64",
"nullable": false
},
{
"name": "status",
"type": "dictionary<values=string, indices=int8, ordered=0>",
"nullable": true
}
],
"writer": {
"use_dictionary": true
},
"dictionaries": [
{
"path": "status",
"values": [
"active",
"inactive",
"pending"
]
}
]
}
],
"transitions": [
{
"from": "v0",
"to": "v1",
"mutations": [],
"invariants": {
"row_count_preserved": true,
"row_identity_preserved": true,
"rows_retained": true,
"paths_retained": true,
"common_values_preserved": true,
"value_changes": [],
"parquet_schema_preserved": true
}
}
]
}
|