MAPLOOKUP working in select clause but not in where clause

I am currently using Vertica Analytic Database v7.1.1-0. I have a column named impression which stores jsonObject as string eg-
"push": {
"bannerID": "|44123|1131762|123123|"

select TO_CHAR(MAPLOOKUP(MapJSONExtractor(impression),'push.bannerID')) from "VIZVRM4485_ecsegmentation" where impression is not null;

select count(*) as "count" from "VIZVRM4485_ecsegmentation" where impression is not null
and TO_CHAR(MAPLOOKUP(MapJSONExtractor(impression),'push.bannerID')) like '%bb%'

Running MAPLOOKUP in query 1 gives me expected result but MAPLOOKUP in query2 gives error.

[Code: 5861, SQL State: VP001] [Vertica]VJDBC ERROR: Error calling processBlock() in User Function MapJSONExtractor at [src/JSONParser.cpp:958], error code: 0, message: Unrecoverable parse exception while processing partition: [Unrecoverable YAJL Error on record # [1] with status: [parse error] and [1] Bytes consumed: [lexical error: invalid char in json text.

Please Help!!

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