<s>
Jaql	B-Application
(	O
pronounced	O
"	O
jackal	O
"	O
)	O
is	O
a	O
functional	B-Language
data	O
processing	O
and	O
query	O
language	O
most	O
commonly	O
used	O
for	O
JSON	B-General_Concept
query	O
processing	O
on	O
big	O
data	O
.	O
</s>
<s>
It	O
started	O
as	O
an	O
open	O
source	O
project	O
at	O
Google	B-Application
but	O
the	O
latest	O
release	O
was	O
on	O
2010-07-12	O
.	O
</s>
<s>
IBM	O
took	O
it	O
over	O
as	O
primary	O
data	O
processing	O
language	O
for	O
their	O
Hadoop	B-Application
software	O
package	O
.	O
</s>
<s>
Although	O
having	O
been	O
developed	O
for	O
JSON	B-General_Concept
it	O
supports	O
a	O
variety	O
of	O
other	O
data	O
sources	O
like	O
CSV	O
,	O
TSV	B-Protocol
,	O
XML	B-Protocol
.	O
</s>
<s>
A	O
comparison	O
to	O
other	O
BigData	O
query	O
languages	O
like	O
PIG	B-Language
Latin	I-Language
and	O
Hive	B-General_Concept
QL	I-General_Concept
illustrates	O
performance	O
and	O
usability	O
aspects	O
of	O
these	O
technologies	O
.	O
</s>
<s>
Jaql	B-Application
supports	O
lazy	O
evaluation	O
,	O
so	O
expressions	O
are	O
only	O
materialized	O
when	O
needed	O
.	O
</s>
<s>
So	O
typically	O
a	O
Jaql	B-Application
program	O
has	O
to	O
following	O
structure	O
,	O
expressing	O
a	O
data	O
processing	O
graph	O
:	O
</s>
<s>
Most	O
commonly	O
for	O
readability	O
reasons	O
Jaql	B-Application
programs	O
are	O
linebreaked	O
after	O
the	O
arrow	O
,	O
as	O
is	O
also	O
a	O
common	O
idiom	O
in	O
Twitter	O
:	O
</s>
<s>
It	O
is	O
the	O
Jaql	B-Application
equivalent	O
of	O
the	O
SQL	B-Language
WHERE	I-Language
clause	O
.	O
</s>
