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GH-48448: [Python] Implement Alphanumeric and Surrogate text in the random schema generator #48449

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GH-48448: [Python] Implement Alphanumeric and Surrogate text in the random schema generator #48449

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31 changes: 27 additions & 4 deletions python/pyarrow/tests/strategies.py
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Original file line number Diff line number Diff line change
Expand Up @@ -46,14 +46,31 @@
import pyarrow as pa


# TODO(kszucs): alphanum_text, surrogate_text
# Text generation strategies for various character sets
custom_text = st.text(
alphabet=st.characters(
min_codepoint=0x41,
max_codepoint=0x7E
)
)

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@HyukjinKwon HyukjinKwon Dec 11, 2025

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I referred to https://www.unicode.org/reports/tr44/#General_Category_Values and https://datatracker.ietf.org/doc/html/rfc2781#section-2.1

# alphanum_text: Only alphanumeric characters (a-z, A-Z, 0-9)
alphanum_text = st.text(
alphabet=st.characters(
whitelist_categories=('Ll', 'Lu', 'Nd'), # Lowercase, Uppercase, Decimal Number
min_codepoint=0x30, # Start from '0' (U+0030)
max_codepoint=0x7A # End at 'z' (U+007A)
)
)

# surrogate_text: Unicode supplementary planes (U+10000 to U+10FFFF)
surrogate_text = st.text(
alphabet=st.characters(
min_codepoint=0x10000, # Start of Plane 1 (Supplementary Multilingual Plane)
max_codepoint=0x10FFFF # End of valid Unicode range (last code point)
)
)

null_type = st.just(pa.null())
bool_type = st.just(pa.bool_())

Expand Down Expand Up @@ -164,8 +181,10 @@


@st.composite
def fields(draw, type_strategy=primitive_types):
name = draw(custom_text)
def fields(draw, type_strategy=primitive_types, name_strategy=None):
if name_strategy is None:
name_strategy = custom_text
name = draw(name_strategy)
typ = draw(type_strategy)
if pa.types.is_null(typ):
nullable = True
Expand Down Expand Up @@ -243,7 +262,11 @@ def schemas(type_strategy=primitive_types, max_fields=None):
struct_types(all_types)
)
)
all_fields = fields(all_types)
all_fields = st.one_of(
fields(all_types), # custom_text
fields(all_types, name_strategy=alphanum_text),
fields(all_types, name_strategy=surrogate_text)
)
all_schemas = schemas(all_types)


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