SPI_freetuptable — free a row set created by
SPI_execute or a similar function
void SPI_freetuptable(SPITupleTable *
SPI_freetuptable frees a row set created by a prior SPI command execution function, such as
SPI_execute. Therefore, this function is often called with the global variable
SPI_tuptable as argument.
This function is useful if an SPI-using C function needs to execute multiple commands and does not want to keep the results of earlier commands around until it ends. Note that any unfreed row sets will be freed anyway at
SPI_finish. Also, if a subtransaction is started and then aborted within execution of an SPI-using C function, SPI automatically frees any row sets created while the subtransaction was running.
Beginning in PostgreSQL 9.3,
SPI_freetuptable contains guard logic to protect against duplicate deletion requests for the same row set. In previous releases, duplicate deletions would lead to crashes.
pointer to row set to free, or NULL to do nothing
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