DEFAULT_TABLE_UDF_ROW_COUNT Option
Enables you to override the default estimate of the number of rows to return from a table UDF (either a C, C++, or Java table UDF).
0 to 4294967295
200000
Option can be set at the database (PUBLIC) or user level. At the database level, the value becomes the default for any new user, but has no impact on existing users. At the user level, overrides the PUBLIC value for that user only. No system privilege is required to set option for self. System privilege is required to set at database level or at user level for any user other than self.
Requires the SET ANY PUBLIC OPTION system privilege to set this option. Can be set temporary for an individual connection or for the PUBLIC role. Takes effect immediately.
A table UDF can use the DEFAULT_TABLE_UDF_ROW_COUNT option to give the query processor an estimate for the number of rows that a table UDF will return. This is the only way a Java table UDF can convey this information. However, for a C or C++ table UDF, the UDF developer should consider publishing this information in the describe phase using the EXTFNAPIV4_DESCRIBE_PARM_TABLE_NUM_ROWS describe parameter to publish the number of rows it expects to return. The value of EXTFNAPIV4_DESCRIBE_PARM_TABLE_NUM_ROWS always overrides the value of the DEFAULT_PROXY_TABLE_UDF_ROW_COUNT option.