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Oid SPI_gettypeid(TupleDesc rowdesc, int colnumber)
SPI_gettypeid
returns the
OID of the data type of the specified column.
input row description
column number (count starts at 1)
The OID of the data type of the specified column or InvalidOid on error. On error, SPI_result is set to SPI_ERROR_NOATTRIBUTE.