Support match function in SQL/PPL query engine

[chloe-zh]

Related design is presented in issue #182

Todo list

• Support the match functionality by pushing it down to the search engine
• Enable match function in SQL and PPL syntax and parser, including all the available parameters
• Make sure the function in new engine is compatible with the old engine support
• Add unit tests. (Unit tests are mandatory for all code changes.)
• Add integration test cases for match
• Update user manual

Function details

The match function maps to the match query used in search engine, to return the documents that match a provided text, number, date or boolean value with a given field.

Syntax:
match(field_expression, query_expression[, option=<option_value>]*)

Available options:

• analyzer
• auto_generate_synonyms_phrase
• fuzziness
• max_expansions
• prefix_length
• fuzzy_transpositions
• fuzzy_rewrite
• lenient
• operator
• minimum_should_match
• zero_terms_query
• boost

Sample queries:

# Search query 1
GET my_index/_search
{
  "query": {
    "match": {
      "message": "this is a test"
    }
  }
}

# SQL
SELECT message FROM my_index WHERE match(message, "this is a test")

# PPL
search source=my_index | match field=message query="this is a test"


# Search query 2
GET my_index/_search
{
  "query": {
    "match": {
      "message": {
        "query": "this is a test",
        "operator": "and"
      }
    }
  }
}

# SQL
SELECT message FROM my_index WHERE match(message, "this is a test", operator=and)

# PPL
search source=my_index | match field=message query="this is a test" operator=and


# Search query 3
GET my_index/_search
{
  "query": {
    "match": {
      "message": {
        "query": "to be or not to be",
        "operator": "and",
        "zero_terms_query": "all"
      }
    }
  }
}

# SQL
SELECT message FROM my_index WHERE match(message, "this is a test", operator=and, zero_terms_query=all)

# PPL
search source=my_index | where match(message, "this is a test", operator=and, zero_terms_query=all)

[chloe-zh]

PoC: https://github.com/chloe-zh/opensearch-sql/tree/poc/match