diff options
Diffstat (limited to 'container-search/src/main/java/com/yahoo/prelude/query')
6 files changed, 52 insertions, 7 deletions
diff --git a/container-search/src/main/java/com/yahoo/prelude/query/CompositeItem.java b/container-search/src/main/java/com/yahoo/prelude/query/CompositeItem.java index 907eabe60ce..64f759dcf9c 100644 --- a/container-search/src/main/java/com/yahoo/prelude/query/CompositeItem.java +++ b/container-search/src/main/java/com/yahoo/prelude/query/CompositeItem.java @@ -13,6 +13,7 @@ import java.util.Collections; import java.util.Iterator; import java.util.List; import java.util.ListIterator; +import java.util.Optional; /** @@ -379,4 +380,13 @@ public abstract class CompositeItem extends Item { return terms; } + /** + * Will return its single child if itself can safely be omitted. + * + * @return a valid Item or empty Optional if it can not be done + */ + public Optional<Item> extractSingleChild() { + return getItemCount() == 1 ? Optional.of(getItem(0)) : Optional.empty(); + } + } diff --git a/container-search/src/main/java/com/yahoo/prelude/query/NonReducibleCompositeItem.java b/container-search/src/main/java/com/yahoo/prelude/query/NonReducibleCompositeItem.java index 84aa177369a..97d724953ea 100644 --- a/container-search/src/main/java/com/yahoo/prelude/query/NonReducibleCompositeItem.java +++ b/container-search/src/main/java/com/yahoo/prelude/query/NonReducibleCompositeItem.java @@ -1,6 +1,8 @@ // Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root. package com.yahoo.prelude.query; +import java.util.Optional; + /** * A composite item which specifies semantics which are not maintained * if an instance with a single child is replaced by the single child. @@ -12,4 +14,8 @@ package com.yahoo.prelude.query; * @author bratseth */ public abstract class NonReducibleCompositeItem extends CompositeItem { + @Override + public Optional<Item> extractSingleChild() { + return Optional.empty(); + } } diff --git a/container-search/src/main/java/com/yahoo/prelude/query/PhraseItem.java b/container-search/src/main/java/com/yahoo/prelude/query/PhraseItem.java index 26da5eec7eb..4de0af1f408 100644 --- a/container-search/src/main/java/com/yahoo/prelude/query/PhraseItem.java +++ b/container-search/src/main/java/com/yahoo/prelude/query/PhraseItem.java @@ -5,6 +5,7 @@ import com.yahoo.prelude.query.textualrepresentation.Discloser; import java.nio.ByteBuffer; import java.util.Iterator; +import java.util.Optional; /** * A term which contains a phrase - a collection of word terms @@ -127,6 +128,13 @@ public class PhraseItem extends CompositeIndexedItem { } } + @Override + public Optional<Item> extractSingleChild() { + Optional<Item> extracted = super.extractSingleChild(); + extracted.ifPresent(e -> e.setWeight(this.getWeight())); + return extracted; + } + private void addIndexedItem(IndexedItem word) { word.setIndexName(this.getIndexName()); super.addItem((Item) word); diff --git a/container-search/src/main/java/com/yahoo/prelude/query/PhraseSegmentItem.java b/container-search/src/main/java/com/yahoo/prelude/query/PhraseSegmentItem.java index a19a6e53963..53a57a968f5 100644 --- a/container-search/src/main/java/com/yahoo/prelude/query/PhraseSegmentItem.java +++ b/container-search/src/main/java/com/yahoo/prelude/query/PhraseSegmentItem.java @@ -5,6 +5,7 @@ import com.yahoo.prelude.query.textualrepresentation.Discloser; import java.nio.ByteBuffer; import java.util.Iterator; +import java.util.Optional; /** @@ -55,10 +56,12 @@ public class PhraseSegmentItem extends IndexedSegmentItem { super(rawWord, current, isFromQuery, stemmed, substring); } + @Override public ItemType getItemType() { return ItemType.PHRASE; } + @Override public String getName() { return "SPHRASE"; } @@ -87,6 +90,7 @@ public class PhraseSegmentItem extends IndexedSegmentItem { * * @throws IllegalArgumentException if the given item is not a WordItem or PhraseItem */ + @Override public void addItem(Item item) { if (item instanceof WordItem) { addWordItem((WordItem) item); @@ -95,6 +99,13 @@ public class PhraseSegmentItem extends IndexedSegmentItem { } } + @Override + public Optional<Item> extractSingleChild() { + Optional<Item> extracted = super.extractSingleChild(); + extracted.ifPresent(e -> e.setWeight(this.getWeight())); + return extracted; + } + private void addWordItem(WordItem word) { word.setIndexName(this.getIndexName()); super.addItem(word); diff --git a/container-search/src/main/java/com/yahoo/prelude/query/QueryCanonicalizer.java b/container-search/src/main/java/com/yahoo/prelude/query/QueryCanonicalizer.java index 31e69e5b7cd..88bae76b26d 100644 --- a/container-search/src/main/java/com/yahoo/prelude/query/QueryCanonicalizer.java +++ b/container-search/src/main/java/com/yahoo/prelude/query/QueryCanonicalizer.java @@ -4,7 +4,10 @@ package com.yahoo.prelude.query; import com.yahoo.search.Query; import com.yahoo.search.query.QueryTree; -import java.util.*; +import java.util.HashSet; +import java.util.ListIterator; +import java.util.Optional; +import java.util.Set; /** * Query normalizer and sanity checker. @@ -82,15 +85,11 @@ public class QueryCanonicalizer { if (composite.getItemCount() == 0) parentIterator.remove(); - if (composite.getItemCount() == 1 && ! (composite instanceof NonReducibleCompositeItem)) { - if (composite instanceof PhraseItem || composite instanceof PhraseSegmentItem) - composite.getItem(0).setWeight(composite.getWeight()); - parentIterator.set(composite.getItem(0)); - } + composite.extractSingleChild().ifPresent(extractedChild -> parentIterator.set(extractedChild)); return CanonicalizationResult.success(); } - + private static void collapseLevels(CompositeItem composite) { if (composite instanceof RankItem || composite instanceof NotItem) { collapseLevels(composite, composite.getItemIterator()); // collapse the first item only diff --git a/container-search/src/main/java/com/yahoo/prelude/query/SameElementItem.java b/container-search/src/main/java/com/yahoo/prelude/query/SameElementItem.java index aa446140da0..d2c19339298 100644 --- a/container-search/src/main/java/com/yahoo/prelude/query/SameElementItem.java +++ b/container-search/src/main/java/com/yahoo/prelude/query/SameElementItem.java @@ -6,6 +6,7 @@ import com.yahoo.protect.Validator; import java.nio.ByteBuffer; import java.util.Iterator; +import java.util.Optional; /** * This represents a query where all terms are required to match in the same element id. @@ -54,6 +55,16 @@ public class SameElementItem extends NonReducibleCompositeItem { Validator.ensureNonEmpty("Struct fieldname", asTerm.getIndexName()); Validator.ensureNonEmpty("Query term", asTerm.getIndexedString()); } + + @Override + public Optional<Item> extractSingleChild() { + if (getItemCount() == 1) { + WordItem child = (WordItem) getItem(0); + child.setIndexName(getFieldName() + "." + child.getIndexName()); + return Optional.of(child); + } + return Optional.empty(); + } @Override public ItemType getItemType() { |