[ES|QL] Allow lookup join on mixed numeric fields (elastic#128263) (elastic#128859)

* allow lookup join on mixed numeric fields

(cherry picked from commit dfe1357)

# Conflicts:
#	x-pack/plugin/esql/qa/testFixtures/src/main/java/org/elasticsearch/xpack/esql/CsvTestsDataLoader.java
#	x-pack/plugin/esql/qa/testFixtures/src/main/resources/lookup-join.csv-spec
#	x-pack/plugin/esql/src/main/java/org/elasticsearch/xpack/esql/action/EsqlCapabilities.java

Author: fang-xing-esql

docs/changelog/128263.yaml

@@ -0,0 +1,5 @@
+pr: 128263
+summary: Allow lookup join on mixed numeric fields
+area: ES|QL
+type: enhancement
+issues: []

x-pack/plugin/esql/qa/testFixtures/src/main/java/org/elasticsearch/xpack/esql/CsvTestsDataLoader.java

@@ -70,6 +70,9 @@ public class CsvTestsDataLoader {
         "mapping-languages_nested_fields.json",
         "languages_nested_fields.csv"
     ).withSetting("languages_lookup-settings.json");
+    private static final TestDataset LANGUAGES_MIX_NUMERICS = new TestDataset("languages_mixed_numerics").withSetting(
+        "languages_lookup-settings.json"
+    );
     private static final TestDataset ALERTS = new TestDataset("alerts");
     private static final TestDataset UL_LOGS = new TestDataset("ul_logs");
     private static final TestDataset SAMPLE_DATA = new TestDataset("sample_data");
@@ -128,6 +131,7 @@ public class CsvTestsDataLoader {
         Map.entry(LANGUAGES_LOOKUP.indexName, LANGUAGES_LOOKUP),
         Map.entry(LANGUAGES_LOOKUP_NON_UNIQUE_KEY.indexName, LANGUAGES_LOOKUP_NON_UNIQUE_KEY),
         Map.entry(LANGUAGES_NESTED_FIELDS.indexName, LANGUAGES_NESTED_FIELDS),
+        Map.entry(LANGUAGES_MIX_NUMERICS.indexName, LANGUAGES_MIX_NUMERICS),
         Map.entry(UL_LOGS.indexName, UL_LOGS),
         Map.entry(SAMPLE_DATA.indexName, SAMPLE_DATA),
         Map.entry(MV_SAMPLE_DATA.indexName, MV_SAMPLE_DATA),

x-pack/plugin/esql/qa/testFixtures/src/main/resources/data/languages_mixed_numerics.csv

@@ -0,0 +1,30 @@
+language_code_byte:byte,language_code_short:short,language_code_integer:integer,language_code_long:long,language_code_half_float:half_float,language_code_scaled_float:scaled_float,language_code_float:float,language_code_double:double,language_name:keyword
+1,1,1,1,1.0,1.0,1.0,1.0,English
+2,2,2,2,2.0,2.0,2.0,2.0,French
+3,3,3,3,3.0,3.0,3.0,3.0,Spanish
+4,4,4,4,4.0,4.0,4.0,4.0,German
+-128,-128,-128,-128,-128.0,-128.0,-128.0,-128.0,min_byte
+,-129,-129,-129,-129.0,-129.0,-129.0,-129.0,min_byte_minus_1
+127,127,127,127,127.0,127.0,127.0,127.0,max_byte
+,128,128,128,128.0,128.0,128.0,128.0,max_byte_plus_1
+,-32768,-32768,-32768,-32768.0,-32768.0,-32768.0,-32768.0,min_short
+,,-32769,-32769,-32769.0,-32769.0,-32769.0,-32769.0,min_short_minus_1
+,32767,32767,32767,32767.0,32767.0,32767.0,32767.0,max_short
+,,32768,32768,32768.0,32768.0,32768.0,32768.0,max_short_plus_1
+,,-2147483648,-2147483648,,-2147483648.0,-2147483648.0,-2147483648.0,min_int
+,,,-2147483649,,-2147483649.0,-2147483649.0,-2147483649.0,min_int_minus_1
+,,2147483646,2147483646,,2147483646.0,2147483646.0,2147483646.0,max_int_minus_1
+,,2147483647,2147483647,,2147483647.0,2147483647.0,2147483647.0,max_int
+,,,2147483648,,2147483648.0,2147483648.0,2147483648.0,max_int_plus_1
+,,,-9223372036854775808,,-9223372036854775808.0,-9223372036854775808.0,-9223372036854775808.0,min_long
+,,,,,-9223372036854775809.0,-9223372036854775809.0,-9223372036854775809.0,min_long_minus_1
+,,,9223372036854775806,,9223372036854775806.0,9223372036854775806.0,9223372036854775806.0,max_long_minus_1
+,,,9223372036854775807,,9223372036854775807.0,9223372036854775807.0,9223372036854775807.0,max_long
+,,,,,9223372036854775808.0,9223372036854775808.0,9223372036854775808.0,max_long_plus_1
+,,65504,65504,65504.0,65504.0,65504.0,65504.0,max_half_float
+,,65505,65505,65505.0,65505.0,65505.0,65505.0,max_half_float_plus_1
+,,-65504,-65504,-65504.0,-65504.0,-65504.0,-65504.0,min_half_float
+,,-65505,-65505,-65505.0,-65505.0,-65505.0,-65505.0,min_half_float_minus_1
+,,,,,,3.40282346638528860e+38,3.40282346638528860e+38,max_float
+,,,,,,-3.40282346638528860e+38,-3.40282346638528860e+38,min_float
+,,,,,,,3.40282346638528860e+39,double