REPLACE_MULTI implements eval function to replace all occurrences of search
keys with replacement values. Search - Replacement values are specified in
input_data = LOAD 'input_data' as (name); -- name = 'Hello World!'
replaced_name = FOREACH input_data GENERATE REPLACE_MULTI ( name, [ ' '#'_', '!'#'', 'e'#'a', 'o'#'oo' ] ); -- replaced_name = Halloo_Woorld
The first argument is the source string on which REPLACE_MULTI operation is
performed. The second argument is a map having search key - replacement value
Nested Class Summary
Nested classes/interfaces inherited from class org.apache.pig.EvalFunc
Allow a UDF to specify type specific implementations of itself. For example,
an implementation of arithmetic sum might have int and float implementations,
since integer arithmetic performs much better than floating point arithmetic. Pig's
typechecker will call this method and using the returned list plus the schema
of the function's input data, decide which implementation of the UDF to use.
A List containing FuncSpec objects representing the EvalFunc class
which can handle the inputs corresponding to the schema in the objects. Each
FuncSpec should be constructed with a schema that describes the input for that
implementation. For example, the sum function above would return two elements in its
FuncSpec(this.getClass().getName(), new Schema(new Schema.FieldSchema(null, DataType.DOUBLE)))
FuncSpec(IntSum.getClass().getName(), new Schema(new Schema.FieldSchema(null, DataType.INTEGER)))
This would indicate that the main implementation is used for doubles, and the special
implementation IntSum is used for ints.