Fix ondemand query error parsing

[niveathika]

Purpose

$subject fix #969

Security checks

• Followed secure coding standards in http://wso2.com/technical-reports/wso2-secure-engineering-guidelines? yes
• Ran FindSecurityBugs plugin and verified report? yes
• Confirmed that this PR doesn't commit any keys, passwords, tokens, usernames, or other secrets? yes

[codecov-io]

Codecov Report

Merging #1588 into master will increase coverage by 0.01%.
The diff coverage is 90.32%.

@@             Coverage Diff              @@
##             master    #1588      +/-   ##
============================================
+ Coverage     67.71%   67.72%   +0.01%     
  Complexity       45       45              
============================================
  Files           650      651       +1     
  Lines         27478    27489      +11     
  Branches       4330     4335       +5     
============================================
+ Hits          18607    18618      +11     
+ Misses         7059     7057       -2     
- Partials       1812     1814       +2

Impacted Files	Coverage Δ	Complexity Δ
...io/siddhi/core/table/record/ExpressionBuilder.java	57.52% <0%> (ø)	0 <0> (ø)	⬇️
...main/java/io/siddhi/core/SiddhiAppRuntimeImpl.java	63.1% <100%> (ø)	0 <0> (ø)	⬇️
...java/io/siddhi/core/config/SiddhiQueryContext.java	87.23% <100%> (+0.56%)	0 <0> (ø)	⬇️
.../java/io/siddhi/query/compiler/SiddhiCompiler.java	89.76% <100%> (+0.08%)	0 <0> (ø)	⬇️
...siddhi/core/util/parser/JoinInputStreamParser.java	81.69% <100%> (ø)	0 <0> (ø)	⬇️
...e/aggregation/IncrementalExecutorsInitialiser.java	51.94% <100%> (ø)	0 <0> (ø)	⬇️
...a/io/siddhi/core/util/parser/ExpressionParser.java	75.75% <100%> (ø)	0 <0> (ø)	⬇️
...ddhi/core/util/parser/SingleInputStreamParser.java	87.61% <100%> (ø)	0 <0> (ø)	⬇️
...siddhi/core/config/SiddhiOnDemandQueryContext.java	100% <100%> (ø)	0 <0> (?)
...o/siddhi/core/util/parser/OnDemandQueryParser.java	91.37% <100%> (ø)	0 <0> (ø)	⬇️
... and 7 more

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