ECL

ECL is a programming language created in 2000.

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ECL is a declarative, data centric programming language designed in 2000 to allow a team of programmers to process big data across a high performance computing cluster without the programmer being involved in many of the lower level, imperative decisions.. Read more on Wikipedia...

ECL website
ECL Wikipedia page
ECL is developed on GitHub and has 521 stars
There are at least 234 ECL repos on GitHub
ECL first developed in LexisNexis Risk Solutions Group
file extensions for ECL include ecl and eclxml
The Google BigQuery Public Dataset GitHub snapshot shows 25 users using ECL in 25 repos on GitHub
Explore ECL snippets on Rosetta Code
CodeMirror package for syntax highlighting ECL
Pygments supports syntax highlighting for ECL
GitHub supports syntax highlighting for ECL
hpccsystems.com was registered in 2010
See also: (5 related languages)Linux, Prolog, Pascal, SQL, Clarion
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Example from Linguist:

/* 
 * Multi-line comment
 */
#option ('slidingJoins', true);

namesRecord :=
            RECORD
string20        surname;
string10        forename;
integer2        age;
integer2        dadAge;
integer2        mumAge;
            END;

namesRecord2 :=
            record
string10        extra;
namesRecord;
            end;

namesTable := dataset('x',namesRecord,FLAT);
namesTable2 := dataset('y',namesRecord2,FLAT);

integer2 aveAgeL(namesRecord l) := (l.dadAge+l.mumAge)/2;
integer2 aveAgeR(namesRecord2 r) := (r.dadAge+r.mumAge)/2;

// Standard join on a function of left and right
output(join(namesTable, namesTable2, aveAgeL(left) = aveAgeR(right)));

//Several simple examples of sliding join syntax
output(join(namesTable, namesTable2, left.age >= right.age - 10 and left.age <= right.age +10));
output(join(namesTable, namesTable2, left.age between right.age - 10 and right.age +10));
output(join(namesTable, namesTable2, left.age between right.age + 10 and right.age +30));
output(join(namesTable, namesTable2, left.age between (right.age + 20) - 10 and (right.age +20) + 10));
output(join(namesTable, namesTable2, aveAgeL(left) between aveAgeR(right)+10 and aveAgeR(right)+40));

//Same, but on strings.  Also includes age to ensure sort is done by non-sliding before sliding.
output(join(namesTable, namesTable2, left.surname between right.surname[1..10]+'AAAAAAAAAA' and right.surname[1..10]+'ZZZZZZZZZZ' and left.age=right.age));
output(join(namesTable, namesTable2, left.surname between right.surname[1..10]+'AAAAAAAAAA' and right.surname[1..10]+'ZZZZZZZZZZ' and left.age=right.age,all));

//This should not generate a self join
output(join(namesTable, namesTable, left.age between right.age - 10 and right.age +10));

Example from Wikipedia:

D := DATASET([{'ECL'},{'Declarative'},{'Data'},{'Centric'},{'Programming'},{'Language'}],{STRING Value;});

Feature	Supported	Token	Example
MultiLine Comments	✓	/* */	/* A comment */
Line Comments	✓	//	// A comment
Comments	✓
Semantic Indentation	X

ECL - Programming language

Language features

Books about ECL from ISBNdb