@Override
public PostgresStatementResult execute(
PostgresQueryContext context, QueryBindings bindings, int maxrows) throws IOException {
PostgresServerSession server = context.getServer();
server.getSessionMonitor().countEvent(StatementTypes.OTHER_STMT);
PostgresMessenger messenger = server.getMessenger();
ServerValueEncoder encoder = server.getValueEncoder();
int nrows = 0;
for (String row : explanation) {
messenger.beginMessage(PostgresMessages.DATA_ROW_TYPE.code());
messenger.writeShort(1);
ByteArrayOutputStream bytes = encoder.encodePObject(row, colType, false);
messenger.writeInt(bytes.size());
messenger.writeByteStream(bytes);
messenger.sendMessage();
nrows++;
if ((maxrows > 0) && (nrows >= maxrows)) break;
}
return commandComplete("EXPLAIN " + nrows, nrows);
}
@Override
public void sendDescription(PostgresQueryContext context, boolean always, boolean params)
throws IOException {
PostgresServerSession server = context.getServer();
PostgresMessenger messenger = server.getMessenger();
if (params) {
messenger.beginMessage(PostgresMessages.PARAMETER_DESCRIPTION_TYPE.code());
messenger.writeShort(0);
messenger.sendMessage();
}
messenger.beginMessage(PostgresMessages.ROW_DESCRIPTION_TYPE.code());
messenger.writeShort(1);
messenger.writeString(colName); // attname
messenger.writeInt(0); // attrelid
messenger.writeShort(0); // attnum
messenger.writeInt(colType.getOid()); // atttypid
messenger.writeShort(colType.getLength()); // attlen
messenger.writeInt(colType.getModifier()); // atttypmod
messenger.writeShort(0);
messenger.sendMessage();
}
