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89 lines
3.1 KiB
Python
89 lines
3.1 KiB
Python
#!/usr/bin/env python
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# Copyright 2012 Cloudera Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import csv
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import sys
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from cStringIO import StringIO
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class PrettyOutputFormatter(object):
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def __init__(self, prettytable):
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self.prettytable = prettytable
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def format(self, rows):
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# Clear rows that already exist in the table.
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self.prettytable.clear_rows()
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try:
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map(self.prettytable.add_row, rows)
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return self.prettytable.get_string()
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except Exception, e:
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# beeswax returns each row as a tab separated string. If a string column
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# value in a row has tabs, it will break the row split. Default to displaying
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# raw results. This will change with a move to hiveserver2.
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# Reference: https://issues.cloudera.org/browse/IMPALA-116
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error_msg = ("Prettytable cannot resolve string columns values that have "
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" embedded tabs. Reverting to tab delimited text output")
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print >>sys.stderr, error_msg
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return '\n'.join(['\t'.join(row) for row in rows])
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class DelimitedOutputFormatter(object):
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def __init__(self, field_delim="\t"):
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if field_delim:
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self.field_delim = field_delim.decode('string-escape')
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if len(self.field_delim) != 1:
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error_msg = ("Illegal delimiter %s, the delimiter "
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"must be a 1-character string." % self.field_delim)
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raise ValueError, error_msg
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def format(self, rows):
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# csv.writer expects a file handle to the input.
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# cStringIO is used as the temporary buffer.
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temp_buffer = StringIO()
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writer = csv.writer(temp_buffer, delimiter=self.field_delim,
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lineterminator='\n', quoting=csv.QUOTE_MINIMAL)
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writer.writerows(rows)
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rows = temp_buffer.getvalue().rstrip('\n')
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temp_buffer.close()
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return rows
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class OutputStream(object):
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def __init__(self, formatter, filename=None):
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"""Helper class for writing query output.
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User should invoke the `write(data)` method of this object.
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`data` is a list of lists.
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"""
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self.formatter = formatter
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self.handle = sys.stdout
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self.filename = filename
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if self.filename:
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try:
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self.handle = open(self.filename, 'ab')
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except IOError, err:
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print >>sys.stderr, "Error opening file %s: %s" % (self.filename, str(err))
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print >>sys.stderr, "Writing to stdout"
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def write(self, data):
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print >>self.handle, self.formatter.format(data)
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self.handle.flush()
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def __del__(self):
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# If the output file cannot be opened, OutputStream defaults to sys.stdout.
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# Don't close the file handle if it points to sys.stdout.
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if self.filename and self.handle != sys.stdout:
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self.handle.close()
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