PostgreSQL Manual
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Oid SPI_gettypeid(TupleDesc rowdesc, int colnumber)
SPI_gettypeid returns the OID of the data type of the specified column.
SPI_gettypeid
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.