Fix a few things here & there

data_diff/__main__.py

@@ -519,7 +519,7 @@ def _data_diff(
 
     else:
         for op, values in diff_iter:
-            color = COLOR_SCHEME[op]
+            color = COLOR_SCHEME.get(op, "grey62")
 
             if json_output:
                 jsonl = json.dumps([op, list(values)])

data_diff/abcs/database_types.py

@@ -1,6 +1,6 @@
 import decimal
 from abc import ABC, abstractmethod
-from typing import Tuple, Union
+from typing import List, Optional, Tuple, Type, TypeVar, Union
 from datetime import datetime
 
 import attrs
@@ -12,9 +12,24 @@
 DbKey = Union[int, str, bytes, ArithUUID, ArithAlphanumeric]
 DbTime = datetime
 
+N = TypeVar("N")
 
-@attrs.define(frozen=True)
+
+@attrs.define(frozen=True, kw_only=True)
 class ColType:
+    # Arbitrary metadata added and fetched at runtime.
+    _notes: List[N] = attrs.field(factory=list, init=False, hash=False, eq=False)
+
+    def add_note(self, note: N) -> None:
+        self._notes.append(note)
+
+    def get_note(self, cls: Type[N]) -> Optional[N]:
+        """Get the latest added note of type ``cls`` or its descendants."""
+        for note in reversed(self._notes):
+            if isinstance(note, cls):
+                return note
+        return None
+
     @property
     def supported(self) -> bool:
         return True

data_diff/databases/base.py

@@ -182,7 +182,7 @@ def apply_queries(self, callback: Callable[[str], Any]):
         q: Expr = next(self.gen)
         while True:
             sql = self.compiler.database.dialect.compile(self.compiler, q)
-            logger.debug("Running SQL (%s-TL): %s", self.compiler.database.name, sql)
+            logger.debug("Running SQL (%s-TL):\n%s", self.compiler.database.name, sql)
             try:
                 try:
                     res = callback(sql) if sql is not SKIP else SKIP
@@ -267,6 +267,8 @@ def _compile(self, compiler: Compiler, elem) -> str:
             return "NULL"
         elif isinstance(elem, Compilable):
             return self.render_compilable(attrs.evolve(compiler, root=False), elem)
+        elif isinstance(elem, ColType):
+            return self.render_coltype(attrs.evolve(compiler, root=False), elem)
         elif isinstance(elem, str):
             return f"'{elem}'"
         elif isinstance(elem, (int, float)):
@@ -359,6 +361,9 @@ def render_compilable(self, c: Compiler, elem: Compilable) -> str:
             raise RuntimeError(f"Cannot render AST of type {elem.__class__}")
         # return elem.compile(compiler.replace(root=False))
 
+    def render_coltype(self, c: Compiler, elem: ColType) -> str:
+        return self.type_repr(elem)
+
     def render_column(self, c: Compiler, elem: Column) -> str:
         if c._table_context:
             if len(c._table_context) > 1:
@@ -876,7 +881,7 @@ def query(self, sql_ast: Union[Expr, Generator], res_type: type = None):
                 if sql_code is SKIP:
                     return SKIP
 
-            logger.debug("Running SQL (%s): %s", self.name, sql_code)
+            logger.debug("Running SQL (%s):\n%s", self.name, sql_code)
 
         if self._interactive and isinstance(sql_ast, Select):
             explained_sql = self.compile(Explain(sql_ast))

data_diff/databases/mssql.py

@@ -16,6 +16,7 @@
 from data_diff.databases.base import Mixin_Schema
 from data_diff.abcs.database_types import (
     JSON,
+    NumericType,
     Timestamp,
     TimestampTZ,
     DbPath,
@@ -50,7 +51,7 @@ def normalize_timestamp(self, value: str, coltype: TemporalType) -> str:
 
         return formatted_value
 
-    def normalize_number(self, value: str, coltype: FractionalType) -> str:
+    def normalize_number(self, value: str, coltype: NumericType) -> str:
         if coltype.precision == 0:
             return f"CAST(FLOOR({value}) AS VARCHAR)"
 

data_diff/hashdiff_tables.py

@@ -3,7 +3,6 @@
 import logging
 from collections import defaultdict
 from typing import Iterator
-from operator import attrgetter
 
 import attrs
 
@@ -71,7 +70,8 @@ class HashDiffer(TableDiffer):
     """
 
     bisection_factor: int = DEFAULT_BISECTION_FACTOR
-    bisection_threshold: Number = DEFAULT_BISECTION_THRESHOLD  # Accepts inf for tests
+    bisection_threshold: int = DEFAULT_BISECTION_THRESHOLD
+    bisection_disabled: bool = False  # i.e. always download the rows (used in tests)
 
     stats: dict = attrs.field(factory=dict)
 
@@ -82,7 +82,7 @@ def __attrs_post_init__(self):
         if self.bisection_factor < 2:
             raise ValueError("Must have at least two segments per iteration (i.e. bisection_factor >= 2)")
 
-    def _validate_and_adjust_columns(self, table1, table2):
+    def _validate_and_adjust_columns(self, table1, table2, *, strict: bool = True):
         for c1, c2 in safezip(table1.relevant_columns, table2.relevant_columns):
             if c1 not in table1._schema:
                 raise ValueError(f"Column '{c1}' not found in schema for table {table1}")
@@ -92,23 +92,23 @@ def _validate_and_adjust_columns(self, table1, table2):
             # Update schemas to minimal mutual precision
             col1 = table1._schema[c1]
             col2 = table2._schema[c2]
-            if isinstance(col1, PrecisionType):
-                if not isinstance(col2, PrecisionType):
+            if isinstance(col1, PrecisionType) and isinstance(col2, PrecisionType):
+                if strict and not isinstance(col2, PrecisionType):
                     raise TypeError(f"Incompatible types for column '{c1}':  {col1} <-> {col2}")
 
-                lowest = min(col1, col2, key=attrgetter("precision"))
+                lowest = min(col1, col2, key=lambda col: col.precision)
 
                 if col1.precision != col2.precision:
                     logger.warning(f"Using reduced precision {lowest} for column '{c1}'. Types={col1}, {col2}")
 
                 table1._schema[c1] = attrs.evolve(col1, precision=lowest.precision, rounds=lowest.rounds)
                 table2._schema[c2] = attrs.evolve(col2, precision=lowest.precision, rounds=lowest.rounds)
 
-            elif isinstance(col1, (NumericType, Boolean)):
-                if not isinstance(col2, (NumericType, Boolean)):
+            elif isinstance(col1, (NumericType, Boolean)) and isinstance(col2, (NumericType, Boolean)):
+                if strict and not isinstance(col2, (NumericType, Boolean)):
                     raise TypeError(f"Incompatible types for column '{c1}':  {col1} <-> {col2}")
 
-                lowest = min(col1, col2, key=attrgetter("precision"))
+                lowest = min(col1, col2, key=lambda col: col.precision)
 
                 if col1.precision != col2.precision:
                     logger.warning(f"Using reduced precision {lowest} for column '{c1}'. Types={col1}, {col2}")
@@ -119,11 +119,11 @@ def _validate_and_adjust_columns(self, table1, table2):
                     table2._schema[c2] = attrs.evolve(col2, precision=lowest.precision)
 
             elif isinstance(col1, ColType_UUID):
-                if not isinstance(col2, ColType_UUID):
+                if strict and not isinstance(col2, ColType_UUID):
                     raise TypeError(f"Incompatible types for column '{c1}':  {col1} <-> {col2}")
 
             elif isinstance(col1, StringType):
-                if not isinstance(col2, StringType):
+                if strict and not isinstance(col2, StringType):
                     raise TypeError(f"Incompatible types for column '{c1}':  {col1} <-> {col2}")
 
         for t in [table1, table2]:
@@ -157,7 +157,7 @@ def _diff_segments(
         # default, data-diff will checksum the section first (when it's below
         # the threshold) and _then_ download it.
         if BENCHMARK:
-            if max_rows < self.bisection_threshold:
+            if self.bisection_disabled or max_rows < self.bisection_threshold:
                 return self._bisect_and_diff_segments(ti, table1, table2, info_tree, level=level, max_rows=max_rows)
 
         (count1, checksum1), (count2, checksum2) = self._threaded_call("count_and_checksum", [table1, table2])
@@ -202,7 +202,7 @@ def _bisect_and_diff_segments(
 
         # If count is below the threshold, just download and compare the columns locally
         # This saves time, as bisection speed is limited by ping and query performance.
-        if max_rows < self.bisection_threshold or max_space_size < self.bisection_factor * 2:
+        if self.bisection_disabled or max_rows < self.bisection_threshold or max_space_size < self.bisection_factor * 2:
             rows1, rows2 = self._threaded_call("get_values", [table1, table2])
             json_cols = {
                 i: colname

data_diff/queries/ast_classes.py

@@ -302,7 +302,7 @@ class CaseWhen(ExprNode):
     def type(self):
         then_types = {_expr_type(case.then) for case in self.cases}
         if self.else_expr:
-            then_types |= _expr_type(self.else_expr)
+            then_types |= {_expr_type(self.else_expr)}
         if len(then_types) > 1:
             raise QB_TypeError(f"Non-matching types in when: {then_types}")
         (t,) = then_types

tests/test_database_types.py

@@ -1,8 +1,8 @@
+import sys
 import unittest
 import time
 import json
 import re
-import math
 import uuid
 from datetime import datetime, timedelta, timezone
 import logging
@@ -765,10 +765,13 @@ def test_types(self, source_db, target_db, source_type, target_type, type_catego
         # reasonable amount of rows each. These will then be downloaded in
         # parallel, using the existing implementation.
         dl_factor = max(int(N_SAMPLES / 100_000), 2) if BENCHMARK else 2
-        dl_threshold = int(N_SAMPLES / dl_factor) + 1 if BENCHMARK else math.inf
+        dl_threshold = int(N_SAMPLES / dl_factor) + 1 if BENCHMARK else sys.maxsize
         dl_threads = N_THREADS
         differ = HashDiffer(
-            bisection_threshold=dl_threshold, bisection_factor=dl_factor, max_threadpool_size=dl_threads
+            bisection_factor=dl_factor,
+            bisection_threshold=dl_threshold,
+            bisection_disabled=True,
+            max_threadpool_size=dl_threads,
         )
         start = time.monotonic()
         diff = list(differ.diff_tables(self.table, self.table2))