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feat: Register Spark array_join function #11948

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feat: Register Spark array_join function #11948

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75f53ff
feat: Register Spark array_join function
zhli1142015 Dec 24, 2024
944f5ad
address comments
zhli1142015 Dec 24, 2024
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9 changes: 9 additions & 0 deletions velox/docs/functions/spark/array.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -66,6 +66,15 @@ Array Functions

SELECT array_intersect(array(1, 2, 3), array(1, 3, 5)); -- [1,3]

.. function:: array_join(x, delimiter, nullReplacement) -> varchar

Concatenates the elements of the given array using the ``delimiter`` and an optional string to replace nulls.
If no value is set for ``nullReplacement``, any null value is filtered. ::

SELECT array_join(ARRAY ["1", "2", "3"], ",") -- "1,2,3"
SELECT array_join(ARRAY ["1", NULL, "2"], ",") -- "1,2"
SELECT array_join(ARRAY ["1", NULL, "2"], ",", "0") -- "1,0,2"

.. spark:function:: array_max(array(E)) -> E

Returns maximum non-NULL element of the array. Returns NULL if array is empty or all elements are NULL.
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16 changes: 16 additions & 0 deletions velox/functions/sparksql/registration/RegisterArray.cpp
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Expand Up @@ -47,6 +47,21 @@ void registerSparkArrayFunctions(const std::string& prefix) {

namespace sparksql {

inline void registerArrayJoinFunctions(const std::string& prefix) {
registerFunction<
ParameterBinder<ArrayJoinFunction, Varchar>,
Varchar,
Array<Varchar>,
Varchar>({prefix + "array_join"});

registerFunction<
ParameterBinder<ArrayJoinFunction, Varchar>,
Varchar,
Array<Varchar>,
Varchar,
Varchar>({prefix + "array_join"});
}

template <typename T>
inline void registerArrayMinMaxFunctions(const std::string& prefix) {
registerFunction<ArrayMinFunction, T, Array<T>>({prefix + "array_min"});
Expand Down Expand Up @@ -94,6 +109,7 @@ inline void registerArrayRemoveFunctions(const std::string& prefix) {
}

void registerArrayFunctions(const std::string& prefix) {
registerArrayJoinFunctions(prefix);
registerArrayMinMaxFunctions(prefix);
registerArrayRemoveFunctions(prefix);
registerSparkArrayFunctions(prefix);
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