Tim Grein created CALCITE-6498: ---------------------------------- Summary: Elasticsearch nested mappings do not work Key: CALCITE-6498 URL: https://issues.apache.org/jira/browse/CALCITE-6498 Project: Calcite Issue Type: Bug Components: elasticsearch-adapter Reporter: Tim Grein Assignee: Tim Grein Fix For: 1.38.0
`EmbeddedElasticsearchPolicy# applyMapping` tries to apply a nested mapping by adding another `properties` field inside a parent field mapping. In Elasticsearch you need to use `fields` rather than `properties` for a nested mapping to work. I've tested this with ES 7 and ES 6 (only including ES 7 example here in the issue description; for ES 6 you need to wrap everything under "mappings" in "_doc"): ES 7: {code:java} PUT /some_index { "mappings": { "properties": { "some_field": { "type": "text", "properties": { "keyword": { "type": "keyword" } } } } } }{code} will lead to the following error: {code:java} { "error" : { "root_cause" : [ { "type" : "mapper_parsing_exception", "reason" : "Mapping definition for [some_field] has unsupported parameters: [properties : {keyword={type=keyword}}]" } ], "type" : "mapper_parsing_exception", "reason" : "Failed to parse mapping [_doc]: Mapping definition for [some_field] has unsupported parameters: [properties : {keyword={type=keyword}}]", "caused_by" : { "type" : "mapper_parsing_exception", "reason" : "Mapping definition for [some_field] has unsupported parameters: [properties : {keyword={type=keyword}}]" } }, "status" : 400 } {code} Successful request: {code:java} PUT /some_index { "mappings": { "properties": { "some_field": { "type": "text", "fields": { "keyword": { "type": "keyword" } } } } } } {code} You'll encounter this error also, if you adapt the test data in ElasticsearchAdapterTest to include nested fields: {code:java} @BeforeAll public static void setupInstance() throws Exception { // "city.keyword" is a nested field with type "keyword" final Map<String, String> mapping = ImmutableMap.of("city", "text", "city.keyword", "keyword", "state", "keyword", "pop", "long"); {code} Error: {code:java} {... {"type":"mapper_parsing_exception","reason":"unknown parameter [properties] on mapper [city] of type [text]"} ...} {code} Looking at `ElasticsearchJson#visitMappingProperties` I assume this will lead to a similar issue, which I'll double-check. This is related to https://issues.apache.org/jira/browse/CALCITE-3027 as you want to detect, if you perform a `LIKE` operator on a purely `text` mapped field, which will lead to weird semantics (`text` mapped fields are analyzed/broken up into several tokens), if you do not prevent it. Usually you have a nested `keyword` mapping for a `text` field, which you can fallback to. So this is rather important to work correctly overall and in the tests. -- This message was sent by Atlassian Jira (v8.20.10#820010)