allow partial pushdown for semi-scripted predicates

[Swiddis]

Description

As like on text returns unsupported operation exceptions instead of predicate analyzer exceptions, this causes the entire expression pushdown to fail since UOE isn't caught in that process. This applies even if some parts of the expression are applicable. So a query like:

source=idx
| where `@timestamp` >= '2023-01-01' and `@timestamp` < '2023-01-04'
| where LIKE(message, '%failed%')
| stats count()

Compiles into a single script that filters documents on a full-table scan. With this fix, it's instead compiled into a script to evaluate the LIKE expression, but the @timestamp predicate is pushed down into DSL:

> echo 'source=logs | where `@timestamp` > "2026-05-22 00:00:00" | where like(raw_log, "nginx") | fields raw_log' | ppl --explain
= Calcite Plan =
== Logical ==
LogicalSystemLimit(fetch=[10000], type=[QUERY_SIZE_LIMIT])
  LogicalProject(raw_log=[$48])
    LogicalFilter(condition=[ILIKE($48, 'nginx', '\')])
      LogicalFilter(condition=[>($55, TIMESTAMP('2026-05-22 00:00:00':VARCHAR))])
        CalciteLogicalIndexScan(table=[[OpenSearch, logs]])


== Physical ==
CalciteEnumerableIndexScan(table=[[OpenSearch, logs]], PushDownContext=[[PROJECT->[raw_log, @timestamp], SCRIPT->AND(>($1, '2026-05-22 00:00:00'), ILIKE($0, 'nginx', '')), PROJECT->[raw_
  "_source": {
    "includes": [
      "raw_log"
    ]
  },
  "from": 0,
  "query": {
    "bool": {
      "adjust_pure_negative": true,
      "boost": 1.0,
      "must": [
        {
          "range": {
            "@timestamp": {
              "boost": 1.0,
              "format": "date_time",
              "from": "2026-05-22T00:00:00.000Z",
              "include_lower": false,
              "include_upper": true,
              "to": null
            }
          }
        },
        {
          "script": {
            "boost": 1.0,
            "script": {
              "lang": "opensearch_compounded_script",
              "params": {
                "DIGESTS": [
                  "raw_log",
                  "nginx",
                  "\\"
                ],
                "SOURCES": [
                  1,
                  2,
                  2
                ],
                "utcTimestamp": 1781818852859481509
              },
              "source": "{\"langType\":\"calcite\",\"script\":\"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\"}"
            }
          }
        }
      ]
    }
  },
  "size": 10000,
  "timeout": "1m"
}, requestedTotalSize=10000, pageSize=null, startFrom=0)])

Related Issues

Related to issue 2 identified in #5491

Check List

• New functionality includes testing.
• New functionality has been documented.
• New functionality has javadoc added.
• New functionality has a user manual doc added.
• New PPL command checklist all confirmed.
• API changes companion pull request created.
• Commits are signed per the DCO using --signoff or -s.
• Public documentation issue/PR created.

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