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pxfbridge.h
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pxfbridge.h
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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*
*/
#ifndef _PXFBRIDGE_H
#define _PXFBRIDGE_H
#include "libchurl.h"
#include "pxfuriparser.h"
#include "cdb/cdbvars.h"
#include "nodes/execnodes.h"
#include "nodes/pg_list.h"
#include "utils/relcache.h"
/*
* Context for single query execution by PXF bridge
*/
typedef struct
{
CHURL_HEADERS churl_headers;
CHURL_HANDLE churl_handle;
GPHDUri *gphd_uri;
StringInfoData uri;
Relation relation;
char *filterstr;
ProjectionInfo *proj_info;
List *quals;
bool completed;
bool after_error;
} gphadoop_context;
/*
* Clean up churl related data structures from the context
*/
void gpbridge_cleanup(gphadoop_context *context);
/*
* Sets up data before starting import
*/
void gpbridge_import_start(gphadoop_context *context);
/*
* Sets up data before starting export
*/
void gpbridge_export_start(gphadoop_context *context);
/*
* Reads data from the PXF server into the given buffer of a given size
*/
int gpbridge_read(gphadoop_context *context, char *databuf, int datalen);
/*
* Writes data from the given buffer of a given size to the PXF server
*/
int gpbridge_write(gphadoop_context *context, char *databuf, int datalen);
#endif /* _PXFBRIDGE_H */