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import collections
from enum import Enum
from typing import Any, Optional, List, Dict, Tuple, Type
import attrs
from data_diff.diff_tables import DiffResultWrapper
from data_diff.abcs.database_types import (
JSON,
Boolean,
ColType,
Array,
ColType_UUID,
Date,
FractionalType,
NumericType,
Struct,
TemporalType,
ColType_Alphanum,
String_Alphanum,
)
def jsonify_error(table1: List[str], table2: List[str], dbt_model: str, error: str) -> "FailedDiff":
return attrs.asdict(
FailedDiff(
status="failed",
model=dbt_model,
dataset1=table1,
dataset2=table2,
error=error,
)
)
Columns = List[Tuple[str, str, ColType]]
def jsonify(
diff: DiffResultWrapper,
dbt_model: str,
dataset1_columns: Columns,
dataset2_columns: Columns,
columns_diff: Dict[str, List[str]],
with_summary: bool = False,
stats_only: bool = False,
) -> "JsonDiff":
"""
Converts the diff result into a JSON-serializable format.
Optionally add stats summary and schema diff.
"""
diff_info = diff.info_tree.info
table1 = diff_info.tables[0]
table2 = diff_info.tables[1]
key_columns = table1.key_columns
t1_exclusive_rows = []
t2_exclusive_rows = []
diff_rows = []
rows = None
schema = [field for field, _ in diff_info.diff_schema]
t1_exclusive_rows, t2_exclusive_rows, diff_rows = _group_rows(diff_info, schema)
if not stats_only:
rows = _make_rows_diff(t1_exclusive_rows, t2_exclusive_rows, diff_rows, key_columns)
summary = None
if with_summary:
summary = _jsonify_diff_summary(diff.get_stats_dict(is_dbt=True))
columns = _jsonify_columns_diff(dataset1_columns, dataset2_columns, columns_diff, list(key_columns))
is_different = bool(
t1_exclusive_rows
or t2_exclusive_rows
or diff_rows
or (columns_diff["added"] or columns_diff["removed"] or columns_diff["changed"])
)
return attrs.asdict(
JsonDiff(
status="success",
result="different" if is_different else "identical",
model=dbt_model,
dataset1=list(table1.table_path),
dataset2=list(table2.table_path),
rows=rows,
summary=summary,
columns=columns,
)
)
@attrs.define(frozen=True)
class JsonExclusiveRowValue:
"""
Value of a single column in a row
"""
isPK: bool
value: Any
@attrs.define(frozen=True)
class JsonDiffRowValue:
"""
Pair of diffed values for 2 rows with equal PKs
"""
dataset1: Any
dataset2: Any
isDiff: bool
isPK: bool
@attrs.define(frozen=True)
class Total:
dataset1: int
dataset2: int
@attrs.define(frozen=True)
class ExclusiveRows:
dataset1: int
dataset2: int
@attrs.define(frozen=True)
class Rows:
total: Total
exclusive: ExclusiveRows
updated: int
unchanged: int
@attrs.define(frozen=True)
class Stats:
diffCounts: Dict[str, int]
@attrs.define(frozen=True)
class JsonDiffSummary:
rows: Rows
stats: Stats
@attrs.define(frozen=True)
class ExclusiveColumns:
dataset1: List[str]
dataset2: List[str]
class ColumnKind(Enum):
INTEGER = "integer"
FLOAT = "float"
STRING = "string"
DATE = "date"
TIME = "time"
DATETIME = "datetime"
BOOL = "boolean"
UNSUPPORTED = "unsupported"
KIND_MAPPING: List[Tuple[Type[ColType], ColumnKind]] = [
(Boolean, ColumnKind.BOOL),
(Date, ColumnKind.DATE),
(TemporalType, ColumnKind.DATETIME),
(FractionalType, ColumnKind.FLOAT),
(NumericType, ColumnKind.INTEGER),
(ColType_UUID, ColumnKind.STRING),
(ColType_Alphanum, ColumnKind.STRING),
(String_Alphanum, ColumnKind.STRING),
(JSON, ColumnKind.STRING),
(Array, ColumnKind.STRING),
(Struct, ColumnKind.STRING),
(ColType, ColumnKind.UNSUPPORTED),
]
@attrs.define(frozen=True)
class Column:
name: str
type: str
kind: str
@attrs.define(frozen=True)
class JsonColumnsSummary:
dataset1: List[Column]
dataset2: List[Column]
primaryKey: List[str]
exclusive: ExclusiveColumns
typeChanged: List[str]
@attrs.define(frozen=True)
class ExclusiveDiff:
dataset1: List[Dict[str, JsonExclusiveRowValue]]
dataset2: List[Dict[str, JsonExclusiveRowValue]]
@attrs.define(frozen=True)
class RowsDiff:
exclusive: ExclusiveDiff
diff: List[Dict[str, JsonDiffRowValue]]
@attrs.define(frozen=True)
class FailedDiff:
status: str # Literal ["failed"]
model: str
dataset1: List[str]
dataset2: List[str]
error: str
version: str = "1.0.0"
@attrs.define(frozen=True)
class JsonDiff:
status: str # Literal ["success"]
result: str # Literal ["different", "identical"]
model: str
dataset1: List[str]
dataset2: List[str]
rows: Optional[RowsDiff]
summary: Optional[JsonDiffSummary]
columns: Optional[JsonColumnsSummary]
version: str = "1.1.0"
def _group_rows(
diff_info: DiffResultWrapper, schema: List[str]
) -> Tuple[List[Dict[str, Any]], List[Dict[str, Any]], List[Dict[str, Any]]]:
t1_exclusive_rows = []
t2_exclusive_rows = []
diff_rows = []
for row in diff_info.diff:
row_w_schema = dict(zip(schema, row))
is_t1_exclusive = row_w_schema["is_exclusive_a"]
is_t2_exclusive = row_w_schema["is_exclusive_b"]
if is_t1_exclusive:
t1_exclusive_rows.append(row_w_schema)
elif is_t2_exclusive:
t2_exclusive_rows.append(row_w_schema)
else:
diff_rows.append(row_w_schema)
return t1_exclusive_rows, t2_exclusive_rows, diff_rows
def _make_rows_diff(
t1_exclusive_rows: List[Dict[str, Any]],
t2_exclusive_rows: List[Dict[str, Any]],
diff_rows: List[Dict[str, Any]],
key_columns: List[str],
) -> RowsDiff:
diff_rows_jsonified = []
for row in diff_rows:
diff_rows_jsonified.append(_jsonify_diff(row, key_columns))
t1_exclusive_rows_jsonified = []
for row in t1_exclusive_rows:
t1_exclusive_rows_jsonified.append(_jsonify_exclusive(row, key_columns))
t2_exclusive_rows_jsonified = []
for row in t2_exclusive_rows:
t2_exclusive_rows_jsonified.append(_jsonify_exclusive(row, key_columns))
return RowsDiff(
exclusive=ExclusiveDiff(dataset1=t1_exclusive_rows_jsonified, dataset2=t2_exclusive_rows_jsonified),
diff=diff_rows_jsonified,
)
def _jsonify_diff(row: Dict[str, Any], key_columns: List[str]) -> Dict[str, JsonDiffRowValue]:
columns = collections.defaultdict(dict)
for field, value in row.items():
if field in ("is_exclusive_a", "is_exclusive_b"):
continue
if field.startswith("is_diff_"):
column_name = field[len("is_diff_") :]
columns[column_name]["isDiff"] = bool(value)
elif field.endswith("_a"):
column_name = field[: -len("_a")]
columns[column_name]["dataset1"] = value
columns[column_name]["isPK"] = column_name in key_columns
elif field.endswith("_b"):
column_name = field[: -len("_b")]
columns[column_name]["dataset2"] = value
columns[column_name]["isPK"] = column_name in key_columns
return {column: JsonDiffRowValue(**data) for column, data in columns.items()}
def _jsonify_exclusive(row: Dict[str, Any], key_columns: List[str]) -> Dict[str, JsonExclusiveRowValue]:
columns = collections.defaultdict(dict)
for field, value in row.items():
if field in ("is_exclusive_a", "is_exclusive_b"):
continue
if field.startswith("is_diff_"):
continue
if field.endswith("_b") and row["is_exclusive_b"]:
column_name = field[: -len("_b")]
columns[column_name]["isPK"] = column_name in key_columns
columns[column_name]["value"] = value
elif field.endswith("_a") and row["is_exclusive_a"]:
column_name = field[: -len("_a")]
columns[column_name]["isPK"] = column_name in key_columns
columns[column_name]["value"] = value
return {column: JsonExclusiveRowValue(**data) for column, data in columns.items()}
def _jsonify_diff_summary(stats_dict: dict) -> JsonDiffSummary:
return JsonDiffSummary(
rows=Rows(
total=Total(dataset1=stats_dict["rows_A"], dataset2=stats_dict["rows_B"]),
exclusive=ExclusiveRows(
dataset1=stats_dict["exclusive_A"],
dataset2=stats_dict["exclusive_B"],
),
updated=stats_dict["updated"],
unchanged=stats_dict["unchanged"],
),
stats=Stats(diffCounts=stats_dict["values"]),
)
def _jsonify_columns_diff(
dataset1_columns: Columns, dataset2_columns: Columns, columns_diff: Dict[str, List[str]], key_columns: List[str]
) -> JsonColumnsSummary:
return JsonColumnsSummary(
dataset1=[
Column(name=name, type=type_, kind=_map_kind(kind).value) for (name, type_, kind) in dataset1_columns
],
dataset2=[
Column(name=name, type=type_, kind=_map_kind(kind).value) for (name, type_, kind) in dataset2_columns
],
primaryKey=key_columns,
exclusive=ExclusiveColumns(
dataset2=list(columns_diff.get("added", [])),
dataset1=list(columns_diff.get("removed", [])),
),
typeChanged=list(columns_diff.get("changed", [])),
)
def _map_kind(kind: ColType) -> ColumnKind:
for raw_kind, json_kind in KIND_MAPPING:
if isinstance(kind, raw_kind):
return json_kind
return ColumnKind.UNSUPPORTED
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