Allocates and initializes the aggregate intermediate storage area according to the serialized size of the obj input argument.
An aggregate UDF uses this method in the Phase.AGR_INIT phase of aggregation.
If the input parameter obj has object type fields, the UDF must initialize those fields to non-null values before calling initCtx(). If obj has array type fields, the UDF must initialize the array itself and each array element to non-null values before calling initCtx().
If the serialized size of obj is larger than the size specified in the CLASS AGGREGATE clause of the CREATE FUNCTION or REPLACE FUNCTION statement for the UDF, initCtx() throws an SQLException to indicate that aggregate storage allocation failed because requested size is too big. The SQLException fields are set to the following values.
|SQLState Field||vendorCode Field|