Creating partial index on a relation
Hello
I am doing a small project in Postgress where i have to achieve the
following:
Suppose i know the index name(lets say index1) and the relation(table1) on
which partial index to has to be build.
I was looking through the code and found that IndexStmt-->whereClause is the
one that i need to populate manually .
As of know i am successful in creating index by giving a call to Method
DefineIndex of indexcmds.c that creates a index on the relation, but this
index is not an partial index.
I found that DefineIndex takes *Expr *predicate* as an parameter which
specifies that partial index has to be built. This predicate is nothing but
*IndexStmt-->whereClause *
So is there a way to populate manually IndexStmt-->whereClause
An example of partial index that i need is if my My table1 schema is (a int
,b int ,c int)
index on c where a is null, b is null and c is not null
Thanks in advance
Regards
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naman.iitb <naman.bbps@gmail.com> wrote:
An example of partial index that i need is if my My table1 schema
is (a int ,b int ,c int)index on c where a is null, b is null and c is not null
Your question is not very clear, but perhaps you are looking for
something like this:
CREATE INDEX index1 ON table1 (c)
WHERE a IS NULL AND b IS NULL AND c IS NOT NULL;
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On 10/29/2013 04:15 PM, naman.iitb wrote:
So is there a way to populate manually IndexStmt-->whereClause
Unless you have an _extremely_ compelling reason, you should probably
just use the SPI routines to execute a CREATE INDEX command.
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