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From njayaram2 <>
Subject [GitHub] incubator-madlib pull request #113: Graph: Add grouping support to SSSP
Date Mon, 10 Apr 2017 23:46:36 GMT
Github user njayaram2 commented on a diff in the pull request:
    --- Diff: src/ports/postgres/modules/graph/sssp.py_in ---
    @@ -33,16 +33,49 @@ from utilities.control import MinWarning
     from utilities.utilities import _assert
     from utilities.utilities import extract_keyvalue_params
     from utilities.utilities import unique_string
    -from utilities.validate_args import get_cols
    -from utilities.validate_args import unquote_ident
    +from utilities.utilities import _string_to_array
    +from utilities.utilities import split_quoted_delimited_str
     from utilities.validate_args import table_exists
     from utilities.validate_args import columns_exist_in_table
     from utilities.validate_args import table_is_empty
    +from utilities.validate_args import get_cols_and_types
    +from utilities.validate_args import get_expr_type
     m4_changequote(`<!', `!>')
    +def _check_groups(tbl1, tbl2, grp_list):
    +	"""
    +	Helper function for joining tables with groups.
    +	Args:
    +		@param tbl1       Name of the first table
    +		@param tbl2       Name of the second table
    +		@param grp_list   The list of grouping columns
    +	"""
    +	sql = []
    +	for i in grp_list:
    +		sql.append(" "+tbl1+"."+i+" = "+tbl2+"."+i+" ")
    +	return " AND ".join(sql)
    --- End diff --
    It's better to use list comprehension for this:
    `' AND '.join([" {tbl1}.{i} = {tbl2}.{i} ".format(**locals()) for i in grp_list])`

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