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Merge pull request #494 from databrickslabs/feature/st_concavehull_is…
…sue117 Add support for ST_ConcaveHull.
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src/main/scala/com/databricks/labs/mosaic/core/geometry/MosaicGeometryESRI.scala
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src/main/scala/com/databricks/labs/mosaic/expressions/geometry/ST_ConcaveHull.scala
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| package com.databricks.labs.mosaic.expressions.geometry | ||
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| import com.databricks.labs.mosaic.core.geometry.MosaicGeometry | ||
| import com.databricks.labs.mosaic.expressions.base.{GenericExpressionFactory, WithExpressionInfo} | ||
| import com.databricks.labs.mosaic.expressions.geometry.base.UnaryVector2ArgExpression | ||
| import com.databricks.labs.mosaic.functions.MosaicExpressionConfig | ||
| import org.apache.spark.sql.adapters.Column | ||
| import org.apache.spark.sql.catalyst.analysis.FunctionRegistry.FunctionBuilder | ||
| import org.apache.spark.sql.catalyst.expressions.Expression | ||
| import org.apache.spark.sql.catalyst.expressions.codegen.CodegenContext | ||
| import org.apache.spark.sql.types.DataType | ||
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| /** | ||
| * Returns the concave hull for a given geometry. It uses lengthRatio and | ||
| * allowHoles to determine the concave hull. lengthRatio is the ratio of the | ||
| * length of the concave hull to the length of the convex hull. If set to 1, | ||
| * this is the same as the convex hull. If set to 0, this is the same as the | ||
| * bounding box. AllowHoles is a boolean that determines whether the concave | ||
| * hull can have holes. If set to true, the concave hull can have holes. If set | ||
| * to false, the concave hull will not have holes. (For PostGIS, the default is | ||
| * false.) | ||
| * @param inputGeom | ||
| * The input geometry. | ||
| * @param expressionConfig | ||
| * Additional arguments for the expression (expressionConfigs). | ||
| */ | ||
| case class ST_ConcaveHull( | ||
| inputGeom: Expression, | ||
| lengthRatio: Expression, | ||
| allowHoles: Expression, | ||
| expressionConfig: MosaicExpressionConfig | ||
| ) extends UnaryVector2ArgExpression[ST_ConcaveHull]( | ||
| inputGeom, | ||
| lengthRatio, | ||
| allowHoles, | ||
| returnsGeometry = true, | ||
| expressionConfig | ||
| ) { | ||
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| override def dataType: DataType = inputGeom.dataType | ||
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| override def geometryTransform(geometry: MosaicGeometry, arg1: Any, arg2: Any): Any = { | ||
| val lenRatio = arg1.asInstanceOf[Double] | ||
| val allowHoles = arg2.asInstanceOf[Boolean] | ||
| geometry.concaveHull(lenRatio, allowHoles) | ||
| } | ||
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| override def geometryCodeGen(geometryRef: String, arg1Ref: String, arg2Ref: String, ctx: CodegenContext): (String, String) = { | ||
| val convexHull = ctx.freshName("concaveHull") | ||
| val code = s"""$mosaicGeomClass $convexHull = $geometryRef.concaveHull($arg1Ref, $arg2Ref);""" | ||
| (code, convexHull) | ||
| } | ||
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| } | ||
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| /** Expression info required for the expression registration for spark SQL. */ | ||
| object ST_ConcaveHull extends WithExpressionInfo { | ||
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| override def name: String = "st_concavehull" | ||
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| override def usage: String = "_FUNC_(expr1, expr2, expr3) - Returns the concave hull for a given geometry with or without holes." | ||
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| override def example: String = | ||
| """ | ||
| | Examples: | ||
| | > SELECT _FUNC_(a, 0.1, false); | ||
| | {"POLYGON (( 0 0, 1 0, 1 1, 0 1 ))"} | ||
| | """.stripMargin | ||
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| override def builder(expressionConfig: MosaicExpressionConfig): FunctionBuilder = { (children: Seq[Expression]) => | ||
| GenericExpressionFactory.construct[ST_ConcaveHull]( | ||
| Array(children.head, Column(children(1)).cast("double").expr, children(2)), | ||
| expressionConfig | ||
| ) | ||
| } | ||
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| } |
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