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https://issues.apache.org/jira/browse/ARROW-1491?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16348891#comment-16348891
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ASF GitHub Bot commented on ARROW-1491:
---------------------------------------
cpcloud commented on a change in pull request #1387: ARROW-1491: [C++] Add
casting implementations from strings to numbers or boolean
URL: https://github.com/apache/arrow/pull/1387#discussion_r165417094
##########
File path: cpp/src/arrow/compute/kernels/cast.cc
##########
@@ -703,6 +706,106 @@ struct CastFunctor<T, DictionaryType,
}
};
+// ----------------------------------------------------------------------
+// String to Number
+
+template <typename T>
+typename std::enable_if<std::is_arithmetic<T>::value && !std::is_same<T,
int8_t>::value &&
+ !std::is_same<T, uint8_t>::value,
+ T>::type
+castStringToNumeric(const std::string& s) {
+ return boost::lexical_cast<T>(s);
+}
+
+template <typename T>
+typename std::enable_if<std::is_same<T, int8_t>::value || std::is_same<T,
uint8_t>::value,
+ T>::type
+castStringToNumeric(const std::string& s) {
+ // Convert to int before casting to T
+ // because boost::lexical_cast does not support 8bit int/uint.
+ return boost::numeric_cast<T>(boost::lexical_cast<int>(s));
+}
+
+template <typename O>
+struct CastFunctor<O, StringType,
+ typename std::enable_if<std::is_base_of<Number,
O>::value>::type> {
+ void operator()(FunctionContext* ctx, const CastOptions& options,
+ const ArrayData& input, ArrayData* output) {
+ using out_type = typename O::c_type;
+ StringArray input_array(input.Copy());
+
+ auto out_data = GetMutableValues<out_type>(output, 1);
+
+ std::function<out_type(const std::string&)> cast_func;
Review comment:
Is this variable used anywhere? It looks like you might've replaced it with
the `castStringToNumeric` function.
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> [C++] Add casting implementations from strings to numbers or boolean
> --------------------------------------------------------------------
>
> Key: ARROW-1491
> URL: https://issues.apache.org/jira/browse/ARROW-1491
> Project: Apache Arrow
> Issue Type: New Feature
> Components: C++
> Reporter: Wes McKinney
> Assignee: Licht Takeuchi
> Priority: Major
> Labels: pull-request-available
> Fix For: 0.9.0
>
>
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