pg.fold
Folders: objects that reduce rows one by one as they come from the network.
Folders: objects that reduce rows one by one as they come from the network.
columnclj
(column col)Return a single column of the result.
Return a single column of the result.
columnsclj
(columns cols)Return certain columns of the result only.
Return certain columns of the result only.
defaultclj
(default)(default acc!)(default acc! row)Collect lazy unparsed rows into a persistent vector.
Collect lazy unparsed rows into a persistent vector.
dummyclj
(dummy)(dummy acc)(dummy acc row)Skip all the rows and return nil.
Skip all the rows and return nil.
firstclj
(first)(first acc)(first acc row)Return the first row only.
Return the first row only.
group-byclj
(group-by f)For one-argument function, build a map like {(f row), [row row ...]}.
For one-argument function, build a map like
{(f row), [row row ...]}.
index-byclj
(index-by f)For one-argument function, build a map like {(f row), row}.
For one-argument function, build a map like
{(f row), row}.
intoclj
(into xform)(into xform to)Pass rows throughout an xform like map, filter, or
their combination. The to argument is a persistent
collection which is used being transient internally.
The items are collected using conj!. When to is
not set, an empty vector is used.
Pass rows throughout an xform like map, filter, or their combination. The `to` argument is a persistent collection which is used being transient internally. The items are collected using `conj!`. When `to` is not set, an empty vector is used.
javaclj
(java)(java acc)(java acc row)Produce an ArrayList of HashMaps. Does not require initialization.
Produce an ArrayList of HashMaps. Does not require initialization.
kvclj
(kv fk fv)For a pair of one-argument functions, key and value, build a map like {(key row), (value row)}.
For a pair of one-argument functions, key and value,
build a map like {(key row), (value row)}.
mapclj
(map f)Apply a function to reach row; collect the results into a persistent vector.
Apply a function to reach row; collect the results into a persistent vector.
reduceclj
(reduce f init)Reduce the rows using a reducing function of two arguments (an accumulator and the current row) and an initial accumulator value.
Reduce the rows using a reducing function of two arguments (an accumulator and the current row) and an initial accumulator value.
runclj
(run f)Call a function for each row in series skipping the result, presumably with side effects (printing, writing). Return the number of total invocations.
Call a function for each row in series skipping the result, presumably with side effects (printing, writing). Return the number of total invocations.
tableclj
(table)Dump rows into a plain matrix with an extra header row which tracks names of columns.
Dump rows into a plain matrix with an extra header row which tracks names of columns.
to-ednclj
(to-edn writer)Dump rows into an EDN writer. Expects an open java.io.Writer
instance. Doesn't close it afterwards. Should be used within
the with-open macro. Returns a number of rows written.
Dump rows into an EDN writer. Expects an open `java.io.Writer` instance. Doesn't close it afterwards. Should be used within the `with-open` macro. Returns a number of rows written.
to-jsonclj
(to-json writer)Dump rows into a JSON writer. Expects an open java.io.Writer
instance. Doesn't close it afterwards. Should be used within
the with-open macro. Returns a number of rows written.
Dump rows into a JSON writer. Expects an open `java.io.Writer` instance. Doesn't close it afterwards. Should be used within the `with-open` macro. Returns a number of rows written.
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