mix:custom > mix:title
  - nt:a (string)
mix:custom2 > mix:title
  - nt:b (string)

<index name="custom_names" provider-name="local" synchronous="true" node-type="mix:custom" columns="jcr:name(NAME)" />
<index name="custom2_names" provider-name="local" synchronous="true" node-type="mix:custom2" columns="jcr:name(NAME)" />

SELECT * FROM [mix:custom] as custom where custom.[jcr:name] = 'myFirstBook'

JCR-SQL2 -> SELECT * FROM [mix:custom] as custom where custom.[jcr:name] = 'myFirstBook'
AQM -> SELECT * FROM [mix:custom] AS custom WHERE custom.[jcr:name] = 'myFirstBook'
 plan -> Access [custom]
  Project [custom] <PROJECT_COLUMNS=[custom.[jcr:title], custom.[jcr:description], custom.[mode:localName], custom.[mode:id], custom.[mode:depth], custom.[jcr:score], custom.[jcr:path], custom.[jcr:name]], PROJECT_COLUMN_TYPES=[STRING, STRING, STRING, STRING, LONG, DOUBLE, STRING, STRING]>
    Select [custom] <SELECT_CRITERIA=NAME(custom) = 'myFirstBook'>
      Select [custom] <SELECT_CRITERIA=custom.[jcr:mixinTypes] = 'mix:custom'>
        Source [custom] <SOURCE_NAME=__ALLNODES__, SOURCE_ALIAS=custom, SOURCE_COLUMNS=[jcr:isCheckedOut(BOOLEAN), jcr:defaultPrimaryType(STRING), mode:uri(STRING), mode:lockingSession(STRING), jcr:etag(STRING), jcr:created(DATE), jcr:sameNameSiblings(BOOLEAN), jcr:encoding(STRING), jcr:workspace(STRING), jcr:activityTitle(STRING), jcr:mergeFailed(STRING), jcr:frozenMixinTypes(STRING), jcr:isQueryOrderable(BOOLEAN), jcr:lastModifiedBy(STRING), jcr:childVersionHistory(STRING), mode:synchronous(BOOLEAN), jcr:repository(STRING), mode:derivedAt(DATE), jcr:lastModified(DATE), jcr:successors(STRING), jcr:availableQueryOperators(STRING), mode:derivedFrom(STRING), jcr:primaryItemName(STRING), mode:isSessionScoped(BOOLEAN), jcr:frozenUuid(STRING), jcr:isFullTextSearchable(BOOLEAN), jcr:defaultValues(STRING), mode:sharedUuid(STRING), jcr:predecessors(STRING), jcr:content(STRING), mode:projectedNodeKey(STRING), jcr:language(STRING), jcr:valueConstraints(STRING), mode:sha1(STRING), jcr:activity(STRING), jcr:requiredPrimaryTypes(STRING), jcr:baseVersion(STRING), jcr:requiredType(STRING), jcr:autoCreated(BOOLEAN), jcr:isAbstract(BOOLEAN), mode:externalNodeKey(STRING), jcr:hasOrderableChildNodes(BOOLEAN), mode:lockToken(STRING), mode:kind(STRING), mode:alias(STRING), mode:columnTypeName(STRING), jcr:text(STRING), jcr:mimeType(STRING), mode:workspace(STRING), jcr:data(BINARY), jcr:port(STRING), jcr:protected(BOOLEAN), jcr:primaryType(STRING), mode:expirationDate(DATE), jcr:id(STRING), privileges(STRING), jcr:host(STRING), jcr:lifecyclePolicy(STRING), jcr:versionHistory(STRING), jcr:mixinTypes(STRING), jcr:isQueryable(BOOLEAN), jcr:mandatory(BOOLEAN), jcr:lockIsDeep(BOOLEAN), jcr:currentLifecycleState(STRING), jcr:nodeTypeName(STRING), jcr:isMixin(BOOLEAN), name(STRING), jcr:messageId(STRING), jcr:uuid(STRING), jcr:multiple(BOOLEAN), jcr:title(STRING), jcr:onParentVersion(STRING), mode:nodeTypeName(STRING), jcr:supertypes(STRING), jcr:protocol(STRING), mode:propertyName(STRING), jcr:frozenPrimaryType(STRING), jcr:lockOwner(STRING), jcr:createdBy(STRING), jcr:isDeep(BOOLEAN), jcr:hold(STRING), jcr:configuration(STRING), jcr:description(STRING), jcr:statement(STRING), mode:isHeldBySession(BOOLEAN), mode:workspaces(STRING), jcr:copiedFrom(STRING), jcr:retentionPolicy(STRING), jcr:root(STRING), jcr:versionableUuid(STRING), mode:generated(BOOLEAN), mode:localName(STRING), mode:id(STRING), mode:depth(LONG), jcr:score(DOUBLE), jcr:path(STRING), jcr:name(STRING)]>
          Index [custom] <INDEX_SPECIFICATION=custom2_names, provider=local, cost~=100, cardinality~=0, selectivity~=NaN, constraints=[NAME(custom) = 'myFirstBook'], INDEX_USED=true>
          Index [custom] <INDEX_SPECIFICATION=custom_names, provider=local, cost~=100, cardinality~=1, selectivity~=1.0, constraints=[NAME(custom) = 'myFirstBook']>

Result columns: 
 custom.[jcr:title]
 custom.[jcr:description]
 custom.[mode:localName]
 custom.[mode:id]
 custom.[mode:depth]
 custom.[jcr:score]
 custom.[jcr:path]
 custom.[jcr:name]