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| <div class="subTitle">org.apache.drill.exec.record.metadata</div> |
| <h2 title="Interface VariantMetadata" class="title">Interface VariantMetadata</h2> |
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| <dt>All Known Implementing Classes:</dt> |
| <dd><a href="../../../../../../org/apache/drill/exec/record/metadata/VariantSchema.html" title="class in org.apache.drill.exec.record.metadata">VariantSchema</a></dd> |
| </dl> |
| <hr> |
| <br> |
| <pre>public interface <span class="typeNameLabel">VariantMetadata</span></pre> |
| <div class="block">Describes the contents of a list or union field. Such fields are, |
| in effect, a map from minor type to vector, represented here as |
| a map from minor type to column metadata. The child columns used here |
| are a useful fiction. The column name is made up to be the same as |
| the name of the type. |
| <p> |
| In Drill, a union and a list are related, but distinct. In metadata, |
| a union is an optional variant while a list is a variant array. |
| This makes the representation simpler |
| and should be a good-enough approximation of reality. |
| <p> |
| Variants can contain three kinds of children: |
| <ul> |
| <li>Nullable (optional) scalar vectors.</li> |
| <li>Non-nullable (required) map.</li> |
| <li>Nullable (optional) list.</li> |
| </ul> |
| <p> |
| A union cannot contain a repeated vector. Instead, the |
| union can contain a list. Note also that maps can never be optional, |
| so they are required in the union, even though the map is, in effect, |
| optional (the map is effectively null if it is not used for a give |
| row.) Yes, this is confusing, but it is how the vectors are |
| implemented (for now.) |
| <p> |
| A list type is modeled here as a repeated union type. This is not |
| entirely accurate, but it is another useful fiction. (In actual |
| implementation, a list is either a single type, or a array of |
| unions. This detail is abstracted away here.) |
| <p> |
| In vector implementation, unions declare their member types, but |
| lists don't. Here, both types declare their member types. (Another |
| useful fiction.) |
| <p> |
| A union or list can contain a map. Maps have structure. To support this, |
| the metadata allows adding a map column that contains the map structure. |
| Such metadata exist only in this system; it is not easily accessible in |
| the vector implementation. |
| <p> |
| A union or list can contain a list (though not a union.) As described |
| here, lists can have structure, and so, like maps, can be built using |
| a column that provides that structure. |
| <p> |
| Note that the Drill <a href="../../../../../../org/apache/drill/common/types/TypeProtos.MinorType.html#UNION"><code>UNION</code></a> and |
| <a href="../../../../../../org/apache/drill/common/types/TypeProtos.MinorType.html#LIST"><code>LIST</code></a> implementations are considered experimental |
| and are not generally enabled. As a result, this metadata schema must |
| also be considered experimental and subject to change.</div> |
| </li> |
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| <h3>Method Summary</h3> |
| <table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Method Summary table, listing methods, and an explanation"> |
| <caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd"> </span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd"> </span></span><span id="t3" class="tableTab"><span><a href="javascript:show(4);">Abstract Methods</a></span><span class="tabEnd"> </span></span></caption> |
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| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/record/metadata/VariantMetadata.html#addType-org.apache.drill.exec.record.metadata.ColumnMetadata-">addType</a></span>(<a href="../../../../../../org/apache/drill/exec/record/metadata/ColumnMetadata.html" title="interface in org.apache.drill.exec.record.metadata">ColumnMetadata</a> col)</code> |
| <div class="block">Add a column for any supported type to the variant.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code><a href="../../../../../../org/apache/drill/exec/record/metadata/ColumnMetadata.html" title="interface in org.apache.drill.exec.record.metadata">ColumnMetadata</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/record/metadata/VariantMetadata.html#addType-org.apache.drill.common.types.TypeProtos.MinorType-">addType</a></span>(<a href="../../../../../../org/apache/drill/common/types/TypeProtos.MinorType.html" title="enum in org.apache.drill.common.types">TypeProtos.MinorType</a> type)</code> |
| <div class="block">Add any supported type to the variant.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/record/metadata/VariantMetadata.html#becomeSimple--">becomeSimple</a></span>()</code> </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/record/metadata/VariantMetadata.html#hasType-org.apache.drill.common.types.TypeProtos.MinorType-">hasType</a></span>(<a href="../../../../../../org/apache/drill/common/types/TypeProtos.MinorType.html" title="enum in org.apache.drill.common.types">TypeProtos.MinorType</a> type)</code> |
| <div class="block">Determine if the given type is a member of the variant.</div> |
| </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/record/metadata/VariantMetadata.html#isSimple--">isSimple</a></span>()</code> </td> |
| </tr> |
| <tr id="i5" class="rowColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/record/metadata/VariantMetadata.html#isSingleType--">isSingleType</a></span>()</code> |
| <div class="block">A list is defined as a list of variants at the metadata layer.</div> |
| </td> |
| </tr> |
| <tr id="i6" class="altColor"> |
| <td class="colFirst"><code><a href="../../../../../../org/apache/drill/exec/record/metadata/ColumnMetadata.html" title="interface in org.apache.drill.exec.record.metadata">ColumnMetadata</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/record/metadata/VariantMetadata.html#listSubtype--">listSubtype</a></span>()</code> |
| <div class="block">Lists are odd creatures: they contain a union if they have more |
| than one subtype, but are like a nullable repeated type if they |
| contain only one type.</div> |
| </td> |
| </tr> |
| <tr id="i7" class="rowColor"> |
| <td class="colFirst"><code><a href="../../../../../../org/apache/drill/exec/record/metadata/ColumnMetadata.html" title="interface in org.apache.drill.exec.record.metadata">ColumnMetadata</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/record/metadata/VariantMetadata.html#member-org.apache.drill.common.types.TypeProtos.MinorType-">member</a></span>(<a href="../../../../../../org/apache/drill/common/types/TypeProtos.MinorType.html" title="enum in org.apache.drill.common.types">TypeProtos.MinorType</a> type)</code> |
| <div class="block">Retrieve the virtual column for a given type.</div> |
| </td> |
| </tr> |
| <tr id="i8" class="altColor"> |
| <td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</a><<a href="../../../../../../org/apache/drill/exec/record/metadata/ColumnMetadata.html" title="interface in org.apache.drill.exec.record.metadata">ColumnMetadata</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/record/metadata/VariantMetadata.html#members--">members</a></span>()</code> </td> |
| </tr> |
| <tr id="i9" class="rowColor"> |
| <td class="colFirst"><code><a href="../../../../../../org/apache/drill/exec/record/metadata/ColumnMetadata.html" title="interface in org.apache.drill.exec.record.metadata">ColumnMetadata</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/record/metadata/VariantMetadata.html#parent--">parent</a></span>()</code> |
| <div class="block">Return the column that defines this variant structure</div> |
| </td> |
| </tr> |
| <tr id="i10" class="altColor"> |
| <td class="colFirst"><code>int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/record/metadata/VariantMetadata.html#size--">size</a></span>()</code> |
| <div class="block">Returns the number of types in the variant.</div> |
| </td> |
| </tr> |
| <tr id="i11" class="rowColor"> |
| <td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</a><<a href="../../../../../../org/apache/drill/common/types/TypeProtos.MinorType.html" title="enum in org.apache.drill.common.types">TypeProtos.MinorType</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/record/metadata/VariantMetadata.html#types--">types</a></span>()</code> |
| <div class="block">Returns the list of types which are members of this variant.</div> |
| </td> |
| </tr> |
| </table> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| </div> |
| <div class="details"> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <!-- ============ METHOD DETAIL ========== --> |
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| <!-- --> |
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| <h3>Method Detail</h3> |
| <a name="addType-org.apache.drill.common.types.TypeProtos.MinorType-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>addType</h4> |
| <pre><a href="../../../../../../org/apache/drill/exec/record/metadata/ColumnMetadata.html" title="interface in org.apache.drill.exec.record.metadata">ColumnMetadata</a> addType(<a href="../../../../../../org/apache/drill/common/types/TypeProtos.MinorType.html" title="enum in org.apache.drill.common.types">TypeProtos.MinorType</a> type)</pre> |
| <div class="block">Add any supported type to the variant. |
| <p> |
| At present, the union |
| vector does not support the decimal types. This class does not |
| reject such types; but they will cause a runtime exception when |
| code asks the union vector for these types.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>type</code> - type to add</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the "virtual" column for that type</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/IllegalArgumentException.html?is-external=true" title="class or interface in java.lang">IllegalArgumentException</a></code> - if the type has already been |
| added</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="addType-org.apache.drill.exec.record.metadata.ColumnMetadata-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>addType</h4> |
| <pre>void addType(<a href="../../../../../../org/apache/drill/exec/record/metadata/ColumnMetadata.html" title="interface in org.apache.drill.exec.record.metadata">ColumnMetadata</a> col)</pre> |
| <div class="block">Add a column for any supported type to the variant. |
| Use this to add structure to a list or map member.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>col</code> - column to add. The column must have the correct |
| mode. The column's type is used as the type key</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/IllegalArgumentException.html?is-external=true" title="class or interface in java.lang">IllegalArgumentException</a></code> - if the type has already been |
| added, or if the mode is wrong</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="size--"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>size</h4> |
| <pre>int size()</pre> |
| <div class="block">Returns the number of types in the variant.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the number of types in the variant</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="hasType-org.apache.drill.common.types.TypeProtos.MinorType-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>hasType</h4> |
| <pre>boolean hasType(<a href="../../../../../../org/apache/drill/common/types/TypeProtos.MinorType.html" title="enum in org.apache.drill.common.types">TypeProtos.MinorType</a> type)</pre> |
| <div class="block">Determine if the given type is a member of the variant.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>type</code> - type to check</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd><tt>true</tt> if the type is a member, |
| <tt>false</tt> if not</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="types--"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>types</h4> |
| <pre><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</a><<a href="../../../../../../org/apache/drill/common/types/TypeProtos.MinorType.html" title="enum in org.apache.drill.common.types">TypeProtos.MinorType</a>> types()</pre> |
| <div class="block">Returns the list of types which are members of this variant.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the list of types</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="members--"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>members</h4> |
| <pre><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</a><<a href="../../../../../../org/apache/drill/exec/record/metadata/ColumnMetadata.html" title="interface in org.apache.drill.exec.record.metadata">ColumnMetadata</a>> members()</pre> |
| </li> |
| </ul> |
| <a name="member-org.apache.drill.common.types.TypeProtos.MinorType-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>member</h4> |
| <pre><a href="../../../../../../org/apache/drill/exec/record/metadata/ColumnMetadata.html" title="interface in org.apache.drill.exec.record.metadata">ColumnMetadata</a> member(<a href="../../../../../../org/apache/drill/common/types/TypeProtos.MinorType.html" title="enum in org.apache.drill.common.types">TypeProtos.MinorType</a> type)</pre> |
| <div class="block">Retrieve the virtual column for a given type.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>type</code> - the type key</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the virtual column, or <tt>null</tt> if the type |
| is not a member of the variant</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="parent--"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>parent</h4> |
| <pre><a href="../../../../../../org/apache/drill/exec/record/metadata/ColumnMetadata.html" title="interface in org.apache.drill.exec.record.metadata">ColumnMetadata</a> parent()</pre> |
| <div class="block">Return the column that defines this variant structure</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the column that returns this variant structure |
| from its <a href="../../../../../../org/apache/drill/exec/record/metadata/ColumnMetadata.html#variantSchema--"><code>variantSchema()</code></a> |
| method</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="isSingleType--"> |
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| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>isSingleType</h4> |
| <pre>boolean isSingleType()</pre> |
| <div class="block">A list is defined as a list of variants at the metadata layer. |
| But, in implementation, a list will do special processing if the |
| variant (union) contains only one type.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd><tt>true</tt> if this variant contains only one type, |
| </tt>false</tt> if the variant contains 0, 2 or more types</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="listSubtype--"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>listSubtype</h4> |
| <pre><a href="../../../../../../org/apache/drill/exec/record/metadata/ColumnMetadata.html" title="interface in org.apache.drill.exec.record.metadata">ColumnMetadata</a> listSubtype()</pre> |
| <div class="block">Lists are odd creatures: they contain a union if they have more |
| than one subtype, but are like a nullable repeated type if they |
| contain only one type. This method returns the type of the array: |
| either the single type (if <a href="../../../../../../org/apache/drill/exec/record/metadata/VariantMetadata.html#isSingleType--"><code>isSingleType()</code></a> is <tt>true</tt>) |
| or a reference to the synthetic union column nested inside the |
| list.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the metadata for the implicit column within the list</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="becomeSimple--"> |
| <!-- --> |
| </a> |
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| <h4>becomeSimple</h4> |
| <pre>void becomeSimple()</pre> |
| </li> |
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| </a> |
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| <li class="blockList"> |
| <h4>isSimple</h4> |
| <pre>boolean isSimple()</pre> |
| </li> |
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| </li> |
| </ul> |
| </li> |
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