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Support "return null" if there is an exception in casting string to i…
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…nt, bigint, float or double (#44)

* Initial commit

* Add global mapping for new funcs

* Add to header

* Fix args issue

* Check in_valid
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@PHILO-HE @zhztheplayer
PHILO-HE authored and zhztheplayer committed Feb 28, 2022
1 parent fb6df39 commit 557a866
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Showing 3 changed files with 139 additions and 0 deletions.
21 changes: 21 additions & 0 deletions cpp/src/gandiva/function_registry_string.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -134,18 +134,39 @@ std::vector<NativeFunction> GetStringFunctionRegistry() {
NativeFunction("castINT", {}, DataTypeVector{utf8()}, int32(), kResultNullIfNull,
"gdv_fn_castINT_utf8",
NativeFunction::kNeedsContext | NativeFunction::kCanReturnErrors),

// return null if fail to cast
NativeFunction("castINTOrNull", {}, DataTypeVector{utf8()}, int32(), kResultNullInternal,
"gdv_fn_castINT_or_null_utf8",
NativeFunction::kNeedsContext | NativeFunction::kCanReturnErrors),

NativeFunction("castBIGINT", {}, DataTypeVector{utf8()}, int64(), kResultNullIfNull,
"gdv_fn_castBIGINT_utf8",
NativeFunction::kNeedsContext | NativeFunction::kCanReturnErrors),

// return null if fail to cast
NativeFunction("castBIGINTOrNull", {}, DataTypeVector{utf8()}, int64(), kResultNullInternal,
"gdv_fn_castBIGINT_or_null_utf8",
NativeFunction::kNeedsContext | NativeFunction::kCanReturnErrors),

NativeFunction("castFLOAT4", {}, DataTypeVector{utf8()}, float32(),
kResultNullIfNull, "gdv_fn_castFLOAT4_utf8",
NativeFunction::kNeedsContext | NativeFunction::kCanReturnErrors),

// return null if fail to cast
NativeFunction("castFLOAT4OrNull", {}, DataTypeVector{utf8()}, float32(),
kResultNullInternal, "gdv_fn_castFLOAT4_or_null_utf8",
NativeFunction::kNeedsContext | NativeFunction::kCanReturnErrors),

NativeFunction("castFLOAT8", {}, DataTypeVector{utf8()}, float64(),
kResultNullIfNull, "gdv_fn_castFLOAT8_utf8",
NativeFunction::kNeedsContext | NativeFunction::kCanReturnErrors),

// return null if fail to cast
NativeFunction("castFLOAT8OrNull", {}, DataTypeVector{utf8()}, float64(),
kResultNullInternal, "gdv_fn_castFLOAT8_or_null_utf8",
NativeFunction::kNeedsContext | NativeFunction::kCanReturnErrors),

NativeFunction("castVARCHAR", {}, DataTypeVector{int8(), int64()}, utf8(),
kResultNullIfNull, "castVARCHAR_int8_int64",
NativeFunction::kNeedsContext),
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106 changes: 106 additions & 0 deletions cpp/src/gandiva/gdv_function_stubs.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -498,6 +498,40 @@ CAST_NUMERIC_FROM_VARBINARY(double, arrow::DoubleType, FLOAT8)

#undef CAST_NUMERIC_STRING

#define CAST_NUMERIC_OR_NULL_FROM_STRING(OUT_TYPE, ARROW_TYPE, TYPE_NAME) \
GANDIVA_EXPORT \
OUT_TYPE gdv_fn_cast##TYPE_NAME##_or_null_utf8(int64_t context, const char* data, \
int32_t len, bool in_valid, bool* out_valid) { \
OUT_TYPE val = 0; \
*out_valid = true; \
if (!in_valid) { \
*out_valid = false; \
return val; \
} \
/* trim leading and trailing spaces */ \
int32_t trimmed_len; \
int32_t start = 0, end = len - 1; \
while (start <= end && data[start] == ' ') { \
++start; \
} \
while (end >= start && data[end] == ' ') { \
--end; \
} \
trimmed_len = end - start + 1; \
const char* trimmed_data = data + start; \
if (!arrow::internal::ParseValue<ARROW_TYPE>(trimmed_data, trimmed_len, &val)) { \
*out_valid = false; \
} \
return val; \
}

CAST_NUMERIC_OR_NULL_FROM_STRING(int32_t, arrow::Int32Type, INT)
CAST_NUMERIC_OR_NULL_FROM_STRING(int64_t, arrow::Int64Type, BIGINT)
CAST_NUMERIC_OR_NULL_FROM_STRING(float, arrow::FloatType, FLOAT4)
CAST_NUMERIC_OR_NULL_FROM_STRING(double, arrow::DoubleType, FLOAT8)

#undef CAST_NUMERIC_OR_NULL_FROM_STRING

#define GDV_FN_CAST_VARLEN_TYPE_FROM_TYPE(IN_TYPE, CAST_NAME, ARROW_TYPE) \
GANDIVA_EXPORT \
const char* gdv_fn_cast##CAST_NAME##_##IN_TYPE##_int64( \
Expand Down Expand Up @@ -534,6 +568,42 @@ CAST_NUMERIC_FROM_VARBINARY(double, arrow::DoubleType, FLOAT8)
return ret; \
}

#define GDV_FN_CAST_VARCHAR_INTEGER(IN_TYPE, ARROW_TYPE) \
GANDIVA_EXPORT \
const char* gdv_fn_castVARCHAR_##IN_TYPE##_int64(int64_t context, gdv_##IN_TYPE value, \
int64_t len, int32_t * out_len) { \
if (len < 0) { \
gdv_fn_context_set_error_msg(context, "Buffer length can not be negative"); \
*out_len = 0; \
return ""; \
} \
if (len == 0) { \
*out_len = 0; \
return ""; \
} \
arrow::internal::StringFormatter<arrow::ARROW_TYPE> formatter; \
char* ret = reinterpret_cast<char*>( \
gdv_fn_context_arena_malloc(context, static_cast<int32_t>(len))); \
if (ret == nullptr) { \
gdv_fn_context_set_error_msg(context, "Could not allocate memory"); \
*out_len = 0; \
return ""; \
} \
arrow::Status status = formatter(value, [&](arrow::util::string_view v) { \
int64_t size = static_cast<int64_t>(v.size()); \
*out_len = static_cast<int32_t>(len < size ? len : size); \
memcpy(ret, v.data(), *out_len); \
return arrow::Status::OK(); \
}); \
if (!status.ok()) { \
std::string err = "Could not cast " + std::to_string(value) + " to string"; \
gdv_fn_context_set_error_msg(context, err.c_str()); \
*out_len = 0; \
return ""; \
} \
return ret; \
}

#define GDV_FN_CAST_VARLEN_TYPE_FROM_REAL(IN_TYPE, CAST_NAME, ARROW_TYPE) \
GANDIVA_EXPORT \
const char* gdv_fn_cast##CAST_NAME##_##IN_TYPE##_int64( \
Expand Down Expand Up @@ -1379,27 +1449,63 @@ void ExportedStubFunctions::AddMappings(Engine* engine) const {
engine->AddGlobalMappingForFunc("gdv_fn_castINT_utf8", types->i32_type(), args,
reinterpret_cast<void*>(gdv_fn_castINT_utf8));

args = {types->i64_type(), // int64_t context_ptr
types->i8_ptr_type(), // const char* data
types->i32_type(), // int32_t lenr
types->i1_type(), // bool in2_validity
types->ptr_type(types->i8_type())}; // bool* out_valid

engine->AddGlobalMappingForFunc("gdv_fn_castINT_or_null_utf8", types->i32_type(), args,
reinterpret_cast<void*>(gdv_fn_castINT_or_null_utf8));

args = {types->i64_type(), // int64_t context_ptr
types->i8_ptr_type(), // const char* data
types->i32_type()}; // int32_t lenr

engine->AddGlobalMappingForFunc("gdv_fn_castBIGINT_utf8", types->i64_type(), args,
reinterpret_cast<void*>(gdv_fn_castBIGINT_utf8));

args = {types->i64_type(), // int64_t context_ptr
types->i8_ptr_type(), // const char* data
types->i32_type(), // int32_t lenr
types->i1_type(), // bool in2_validity
types->ptr_type(types->i8_type())}; // bool* out_valid

engine->AddGlobalMappingForFunc("gdv_fn_castBIGINT_or_null_utf8", types->i64_type(), args,
reinterpret_cast<void*>(gdv_fn_castBIGINT_or_null_utf8));

args = {types->i64_type(), // int64_t context_ptr
types->i8_ptr_type(), // const char* data
types->i32_type()}; // int32_t lenr

engine->AddGlobalMappingForFunc("gdv_fn_castFLOAT4_utf8", types->float_type(), args,
reinterpret_cast<void*>(gdv_fn_castFLOAT4_utf8));

args = {types->i64_type(), // int64_t context_ptr
types->i8_ptr_type(), // const char* data
types->i32_type(), // int32_t lenr
types->i1_type(), // bool in2_validity
types->ptr_type(types->i8_type())}; // bool* out_valid

engine->AddGlobalMappingForFunc("gdv_fn_castFLOAT4_or_null_utf8", types->float_type(), args,
reinterpret_cast<void*>(gdv_fn_castFLOAT4_or_null_utf8));

args = {types->i64_type(), // int64_t context_ptr
types->i8_ptr_type(), // const char* data
types->i32_type()}; // int32_t lenr

engine->AddGlobalMappingForFunc("gdv_fn_castFLOAT8_utf8", types->double_type(), args,
reinterpret_cast<void*>(gdv_fn_castFLOAT8_utf8));

args = {types->i64_type(), // int64_t context_ptr
types->i8_ptr_type(), // const char* data
types->i32_type(), // int32_t lenr
types->i1_type(), // bool in2_validity
types->ptr_type(types->i8_type())}; // bool* out_valid

engine->AddGlobalMappingForFunc("gdv_fn_castFLOAT8_or_null_utf8", types->double_type(), args,
reinterpret_cast<void*>(gdv_fn_castFLOAT8_or_null_utf8));

// gdv_fn_castVARCHAR_int32_int64
args = {types->i64_type(), // int64_t execution_context
types->i32_type(), // int32_t value
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12 changes: 12 additions & 0 deletions cpp/src/gandiva/gdv_function_stubs.h
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Original file line number Diff line number Diff line change
Expand Up @@ -131,15 +131,27 @@ char* gdv_fn_dec_to_string(int64_t context, int64_t x_high, uint64_t x_low,
GANDIVA_EXPORT
int32_t gdv_fn_castINT_utf8(int64_t context, const char* data, int32_t data_len);

GANDIVA_EXPORT
int32_t gdv_fn_castINT_or_null_utf8(int64_t context, const char* data, int32_t data_len, bool in_valid, bool* out_valid);

GANDIVA_EXPORT
int64_t gdv_fn_castBIGINT_utf8(int64_t context, const char* data, int32_t data_len);

GANDIVA_EXPORT
int64_t gdv_fn_castBIGINT_or_null_utf8(int64_t context, const char* data, int32_t data_len, bool in_valid, bool* out_valid);

GANDIVA_EXPORT
float gdv_fn_castFLOAT4_utf8(int64_t context, const char* data, int32_t data_len);

GANDIVA_EXPORT
float gdv_fn_castFLOAT4_or_null_utf8(int64_t context, const char* data, int32_t data_len, bool in_valid, bool* out_valid);

GANDIVA_EXPORT
double gdv_fn_castFLOAT8_utf8(int64_t context, const char* data, int32_t data_len);

GANDIVA_EXPORT
double gdv_fn_castFLOAT8_or_null_utf8(int64_t context, const char* data, int32_t data_len, bool in_valid, bool* out_valid);

GANDIVA_EXPORT
const char* gdv_fn_castVARCHAR_int32_int64(int64_t context, int32_t value, int64_t len,
int32_t* out_len);
Expand Down

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